Elenco SC130 Snap Circuits® Jr. Select Owner Manual

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Table of Contents
Basic Troubleshooting
Parts List
How to Use It
About Your Snap Circuits® Parts
Introduction to Electricity
!
1
2
Advanced Troubleshooting
3
Project Listings
4-5
Projects 1 - 133
6
Snap Circuits® Project Shapes
7
WARNING: SHOCK HAZARD - Never connect Snap
Circuits® to the electrical outlets in your home in any way!
1. Most circuit problems are due to incorrect
assembly, always double-check that your circuit
exactly matches the drawing for it.
2. Be sure that parts with positive/negative markings
are positioned as per the drawing.
3. Be sure that all connections are securely snapped.
4. Try replacing the batteries.
Elenco® is not responsible for parts damaged due to
incorrect wiring.
Note: If you suspect you have damaged parts, you can follow
the Advanced Troubleshooting procedure on page 8 to determine
which ones need replacing.
!
WARNING: CHOKING HAZARD Small parts. Not for children under 3 years.
WARNING: Always check your wiring
before turning on a circuit. Never leave
a circuit unattended while the batteries
are installed. Never connect additional
batteries or any other power sources to
your circuits. Discard any cracked or
broken parts.
Adult Supervision: Because children’s
abilities vary so much, even with age
groups, adults should exercise
discretion as to which experiments are
suitable and safe (the instructions
should enable supervising adults to
!
Batteries:
●Use only 1.5V AA type, alkaline batteries
(not included).
● Insert batteries with correct polarity.
● Non-rechargeable batteries should not
be recharged. Rechargeable batteries
should only be charged under adult
supervision, and should not be
recharged while in the product.
● Do not mix old and new batteries.
8
9
10 - 51
WARNING FOR ALL PROJECTS WITH A ! SYMBOL - Moving parts. Do not touch the motor or fan during operation.
Do not lean over the motor. Do not launch the fan at people, animals, or objects. Eye protection is recommended.
Basic Troubleshooting
-1-
DOs and DON’Ts of Building Circuits
52
!
Conforms to all applicable U.S.
government requirements and
CAN ICES-3 (B)/NMB-3 (B).
establish the experiment’s suitability
for the child). Make sure your child
reads and follows all of the relevant
instructions and safety procedures,
and keeps them at hand for reference.
This product is intended for use by
adults and children who have attained
sufficient maturity to read and follow
directions and warnings.
Never modify your parts, as doing so
may disable important safety features
in them, and could put your child at risk
of injury.
● Do not connect batteries or battery
holders in parallel.
● Do not mix alkaline, standard (carbonzinc), or rechargeable (nickel-cadmium)
batteries.
● Remove batteries when they are used up.
● Do not short circuit the battery
terminals.
● Never throw batteries in a fire or attempt
to open its outer casing.
● Batteries are harmful if swallowed, so
keep away from small children.
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Parts List (Colors and styles may vary) Symbols and Numbers
Important: If any parts are missing or damaged, DO NOT RETURN TO RETAILER. Call toll-free (800) 533-2441 or e-mail us at:
[email protected]. Customer Service ● 150 Carpenter Ave. ● Wheeling, IL 60090 U.S.A.
Qty.
ID
r3
1
You may order additional / replacement parts at our website: www.snapcircuits.net
Part #
Qty.
ID
1-Snap Wire
6SC01
r1
L1
2.5V Lamp
6SCL1
2-Snap Wire
6SC02
r1
M1
Motor
6SCM1
3-Snap Wire
6SC03
r1
Glow Fan
6SCM1FG
4-Snap Wire
6SC04
r1
Q4
Phototransistor
6SCQ4
5-Snap Wire
6SC05
r1
R1
100W Resistor
6SCR1
Base Grid
(11.0” x 7.7”)
6SCB1
r1
S1
Slide Switch
6SCS1
6SCBG
r1
Press Switch
6SCS2
Color LED
SCD8
SP2
Speaker
6SCSP2
r1
Egg LED Attachment
6SCEGG
r1
r1
S2
r1
U1
r1
Prismatic film
6SCFILM
r1
U2
r5
2
r3
3
r1
4
r1
5
r1
B1
r1
r1
r1
r1
D8
Name
Battery Holder - uses
2 1.5V type AA (not included)
Jumper Wire (Black)
Jumper Wire (Red)
Symbol
6SCJ1
6SCJ2
r1
U3
Name
Symbol
Music
Integrated Circuit
Alarm
Integrated Circuit
Space War
Integrated Circuit
Part #
6SCU1
6SCU2
6SCU3
-2-
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How to Use Snap Circuits®
Snap Circuits® uses building blocks with snaps
to build the different electrical and electronic
circuits in the projects. Each block has a
function: there are switch blocks, light blocks,
battery blocks, different length wire blocks, etc.
These blocks are different colors and have
numbers on them so that you can easily
identify them. The blocks you will be using are
shown as color symbols with level numbers
next to them, allowing you to easily snap them
together to form a circuit.
You need a power source to build each circuit.
This is labeled B1 and requires two (2) 1.5V
“AA” batteries (not included).
Usually when the motor M1 is used, the glow
fan will usually be placed on it. On top of the
motor shaft is a black plastic piece (the motor
top) with three little tabs. Lay the fan on the
black piece so the slots in its bottom “fall into
place” around the three tabs in the motor top.
If not placed properly, the fan will fall off when
the motor starts to spin.
A large clear plastic base grid is included with
this kit to help keep the circuit blocks properly
spaced. You will see evenly spaced posts that
the different blocks snap into. The base has
rows labeled A-G and columns labeled 1-10.
This set contains an egg LED attachment,
which can be mounted on the color LED (D8)
to enhance its light effects.
For Example:
This is the switch block which is green and has
the marking S2 on it. The part symbols in this
booklet may not exactly match the appearance
of the actual parts, but will clearly identify them.
This is a wire block which is blue and comes
in different wire lengths.
This one has the number 2 , 3 , 4 ,
or 5 on it depending on the length of the wire
connection required.
There is also a 1-snap wire that is used as a
spacer or for interconnection between different
layers.
-3-
Next to each part in every circuit drawing is a
small number in black. This tells you which
level the component is placed at. Place all
parts on level 1 first, then all of the parts on
level 2, then all of the parts on level 3, etc.
Some circuits use the jumper wires to make
unusual connections. Just clip them to the
metal snaps or as indicated.
Egg
Egg LED attachment
mounted to D8
Note: While building the projects, be
careful not to accidentally make a direct
connection across the battery holder (a
“short circuit”), as this may damage and/or
quickly drain the batteries.
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About Your Snap Circuits® Parts
(Part designs are subject to change without notice).
BASE GRID
The base grid is a platform for mounting parts
and wires. It functions like the printed circuit
boards used in most electronic products, or like
how the walls are used for mounting the electrical
wiring in your home.
BATTERY HOLDER
The batteries (B1) produce an electrical voltage
using a chemical reaction. This “voltage” can be
thought of as electrical pressure, pushing
electricity through a circuit just like a pump
pushes water through pipes. This voltage is
much lower and much safer than that used in
your house wiring. Using more batteries
increases the “pressure”, therefore, more
electricity flows.
SNAP WIRES & JUMPER WIRES
The blue snap wires
are wires used to
connect components.
They are used to
transport electricity and do
not affect circuit performance.
They come in different lengths to
allow orderly arrangement of connections
on the base grid.
The red and black
jumper wires make
flexible connections for
times when using the snap wires
would be difficult. They also are
used to make connections off the base grid.
Battery Holder (B1)
MOTOR
The motor (M1) converts electricity into
mechanical motion. An electric current in the
motor will turn the shaft and the motor blades,
and the fan blade if it is on the motor.
Glow-in-the-dark Fan
How does electricity turn the shaft in the motor?
The answer is magnetism. Electricity is closely
related to magnetism, and an electric current
flowing in a wire has a magnetic field similar to
that of a very, very tiny magnet. Inside the motor
is a coil of wire with many loops wrapped around
metal plates. This is called an electromagnet. If
a large electric current flows through the loops,
it will turn ordinary metal into a magnet. The
motor shell also has a magnet on it. When
electricity flows through the electromagnet, it
repels from the magnet on the motor shell and
the shaft spins. If the fan is on the motor shaft,
then its blades will create airflow.
Shell
Magnet
Power Contacts
Shaft
Wires transport electricity just like pipes are used
to transport water. The colorful plastic coating
protects them and prevents electricity from
getting in or out.
Motor (M1)
Electromagnet
-4-
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About Your Snap Circuits® Parts
COLOR LED
The color LED (D8) is a light emitting diode,
and may be thought of as a special one-way
light bulb. In the “forward” direction, (indicated
by the “arrow” in the symbol) electricity flows
if the voltage exceeds a turn-on threshold
(about 1.5V for red, about 2.0V for green, and
about 3.0V for blue); brightness then
increases. The color LED contains red, green,
and blue LEDs, with a micro-circuit controlling
then. A high current will burn out an LED, so
the current must be limited by other
components in the circuit (though your Snap
Circuits® LEDs have internal resistors to
protect against incorrect wiring). LEDs block
electricity in the “reverse” direction.
Color LED
(D8)
SLIDE & PRESS SWITCHES
The slide & press switches (S1 & S2) connect
(pressed or “ON”) or disconnect (not pressed or
“OFF”) the wires in a circuit. When ON they have
no effect on circuit performance. Switches turn on
electricity just like a faucet turns on water from a
pipe.
Slide & Press
Switches
(S1 & S2)
-5-
RESISTORS
Resistors “resist” the flow of electricity and are
used to control or limit the current in a circuit.
Snap Circuits® Select includes a 100W
resistor (R1). Materials like metal have very
low resistance (<1W), while materials like
paper, plastic, and air have near-infinite
resistance. Increasing circuit resistance
reduces the flow of electricity.
100W Resistor (R1)
SPEAKER
The speaker (SP2)
converts electricity into
sound by making
mechanical vibrations.
These
vibrations
create variations in air
pressure, which travel
across the room. You
“hear” sound when
your ears feel these air
pressure variations.
ELECTRONIC MODULES
The music, alarm, and space war ICs (U1, U2, and
U3) contain specialized sound-generation ICs and
other supporting components (resistors, capacitors,
and transistors) that are always needed with them.
This was done to simplify the connections you need
to make to use them. Schematics for them are
available at www.snapcircuits.net/faq.
TRG
(–)
IN1
Speaker (SP2)
PHOTOTRANSISTOR
The phototransistor (Q4) is a component
that uses light to control electric current.
Phototransistor (Q4)
(+)
HLD
OUT
IN2
IN3
(–)
OUT
(+)
OUT
IN1
IN2
(–)
Music IC:
(+) - power from batteries
(–) - power return to batteries
OUT - output connection
HLD - hold control input
TRG - trigger control input
Music for a few seconds on
power-up, then hold HLD to (+)
power or touch TRG to (+)
power to resume music.
Alarm IC:
IN1, IN2, IN3 - control inputs
(–) - power return to batteries
OUT - output connection
Connect control inputs to (+)
power to make five alarm
sounds, see project 13 for
configurations.
Space War IC:
(+) - power from batteries
(–) - power return to batteries
OUT - output connection
IN1, IN2 - control inputs
Connect each control input to
(–) power to sequence through
8 sounds.
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Introduction to Electricity
What is electricity? Nobody really knows. We only know how to produce it,
understand its properties, and how to control it. Electricity is the movement of subatomic charged particles (called electrons) through a material due to electrical
pressure across the material, such as from a battery.
There are two ways of arranging parts in a circuit, in series or
in parallel. Here are examples:
Power sources, such as batteries, push electricity through a circuit, like a pump
pushes water through pipes. Wires carry electricity, like pipes carry water. Devices
like LEDs, motors, and speakers use the energy in electricity to do things. Switches
and transistors control the flow of electricity like valves and faucets control water.
Resistors limit the flow of electricity.
The electrical pressure exerted by a battery or other power source is called
voltage and is measured in volts (V). Notice the “+” and “–” signs on the battery;
these indicate which direction the battery will “pump” the electricity.
The electric current is a measure of how fast electricity is flowing in a wire, just
as the water current describes how fast water is flowing in a pipe. It is expressed
in amperes (A) or milliamps (mA, 1/1000 of an ampere).
Series Circuit
The “power” of electricity is a measure of how fast energy is moving through a
wire. It is a combination of the voltage and current (Power = Voltage x Current). It
is expressed in watts (W).
The resistance of a component or circuit represents how much it resists the
electrical pressure (voltage) and limits the flow of electric current. The relationship
is Voltage = Current x Resistance. When the resistance increases, less current
flows. Resistance is measured in ohms (W), or kilo ohms (kW, 1000 ohms).
Nearly all of the electricity used in our world is produced at enormous generators
driven by steam or water pressure. Wires are used to efficiently transport this
energy to homes and businesses where it is used. Motors convert the electricity
back into mechanical form to drive machinery and appliances. The most important
aspect of electricity in our society is that it allows energy to be easily transported
over distances.
Note that “distances” includes not just large distances but also tiny distances. Try
to imagine a plumbing structure of the same complexity as the circuitry inside a
portable radio - it would have to be large because we can’t make water pipes so
small. Electricity allows complex designs to be made very small.
Parallel Circuit
Placing components in series increases the resistance; highest
value dominates. Placing components in parallel decreases the
resistance; lowest value dominates.
The parts within these series and parallel sub-circuits may be
arranged in different ways without changing what the circuit
does. Large circuits are made of combinations of smaller series
and parallel circuits.
-6-
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DOs and DON’Ts of Building Circuits
After building the circuits given in this booklet, you may wish to experiment
on your own. Use the projects in this booklet as a guide, as many important
design concepts are introduced throughout them. Every circuit will include
a power source (the batteries), a resistance (which might be a resistor, lamp,
motor, integrated circuit, etc.), and wiring paths between them and back. You
must be careful not to create “short circuits” (very low-resistance paths
across the batteries, see examples below) as this will damage components
and/or quickly drain your batteries. Only connect the ICs using configurations
given in the projects, incorrectly doing so may damage them. Elenco® is not
responsible for parts damaged due to incorrect wiring.
Here are some important guidelines:
ALWAYS USE EYE PROTECTION WHEN ExPERIMENTING ON YOUR OWN.
ALWAYS include at least one component that will limit the current
through a circuit, such as the speaker, lamp, ICs (which must
be connected properly), motor, phototransistor, or resistor.
ALWAYS use the LED and switches in conjunction with other
components that will limit the current through them. Failure
to do so will create a short circuit and/or damage those
parts.
ALWAYS disconnect your batteries immediately and check your
wiring if something appears to be getting hot.
ALWAYS check your wiring before turning on a circuit.
ALWAYS connect ICs using configurations given in the projects or
as per the connection descriptions for the parts.
NEVER connect to an electrical outlet in your home in any way.
NEVER leave a circuit unattended when it is turned on.
For all of the projects given in this book, the parts may be arranged in
different ways without changing the circuit. For example, the order of
parts connected in series or in parallel does not matter — what matters
is how combinations of these sub-circuits are arranged together.
-7-
!
Warning to Snap Circuits® owners: Do not connect
additional voltage sources from other sets, or you may
damage your parts. Contact ELENCO® if you have
questions or need guidance.
Examples of SHORT CIRCUITS - NEVER DO THESE!!!
Placing a 3-snap wire directly
across the batteries is a
SHORT CIRCUIT.
!
!
NEVER
DO!
This is also a
SHORT CIRCUIT.
NEVER
DO!
When the slide switch (S1) is turned on, this large circuit has a SHORT
CIRCUIT path (as shown by the arrows). The short circuit prevents any
other portions of the circuit from ever working.
!
!
NEVER
DO!
NEVER
DO!
!
NEVER
DO!
You are encouraged to tell us about new programs and circuits you create.
If they are unique, we will post them with your name and state on our
website at: www.snapcircuits.net/learning_center/kids_creation
Send your suggestions to ELENCO®: [email protected].
ELENCO® provides a circuit designer so that you can make your own
Snap Circuits® drawings. This Microsoft® Word document can be
downloaded
from:
www.snapcircuits.net/learning_center/kids_creation
WARNING: SHOCK HAZARD - Never connect Snap Circuits®
to the electrical outlets in your home in any way!
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Advanced Troubleshooting (Adult supervision recommended)
Elenco® is not responsible for parts damaged due to incorrect wiring.
If you suspect you have damaged parts, you can follow
this procedure to systematically determine which ones
need replacing:
1. 2.5V lamp (L1), motor (M1), speaker (SP2), and battery
holder (B1): Place batteries in holder. Place the 2.5V lamp
directly across the battery holder, it should light. Do the same
with the motor (motor + to battery +), it should spin to the right
at high speed. “Tap” the speaker across the battery holder
contacts, you should hear static as it touches. If none work,
then replace your batteries and repeat, if still bad then the
battery holder is damaged.
2. Jumper wires: Use this mini-circuit
to test each jumper wire, the lamp
should light.
3. Snap wires: Use this mini-circuit
to test each of the snap wires, one
at a time. The lamp should light.
4. Slide switch (S1) and Press switch (S2): Build project #1, if
the lamp (L1) doesn’t light then the slide switch is bad. Replace
the slide switch with the press switch to test it.
5. 100W resistor (R1) and color LED (D8): Build project #2
except initially use the speaker (SP2) in place of the resistor,
the color LED should light. Then replace the speaker with the
resistor; the LED should still light.
6. Alarm IC (U2): Build project #110, you should hear a siren.
Then make the variants in projects 111-113 to get the sounds
described there.
7. Music IC (U1): Build project #6. Turn on the switch (S1). A
tune should play for a short time and then stop. Push the press
switch (S2) and music should play until you release S2. Spin
the motor (M1) top with your fingers and you should hear a
short tune.
8. Space war IC (U3) and phototransistor (Q4): Build project
#21, both switches (S1 and S2) should change the sound.
Then replace the slide switch with the phototransistor, covering
and uncovering it as described in project 22 it should change
the sound.
ELENCO®
150 Carpenter Avenue
Wheeling, IL 60090 U.S.A.
Phone: (847) 541-3800
Fax: (847) 520-0085
e-mail: [email protected]
Website: www.elenco.com
You may order additional / replacement parts
at:
www.snapcircuits.net
-8-
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Project Listings
Project #
Description
Page #
1
Electric Light
2
Color Light
3 Motor Controlled Sounds & Light
Light Controlled Color Light
4
5
Musical Doorbell
6
Music Circuit
7
Space War Alarm Combo
8
Flying Saucer
9
Fan
10
Super Circuit
11
Another Super Circuit
12 Yet Another Super Circuit
13 European Siren & Light
14
Siren & Light
15
Silly Sound & Light
16 Fire Engine Siren & Light
17 Machine Gun Sound & Light
18
Conduction Detector
19 Light Controlled Music
20 Finger Controlled Music
21
Space War
22
Photo Space War
23
Super Space War
Super Photo Space War
24
25 Quieter Super Space War
26 Quieter Super Photo Space War
27
Lamp & Fan in Series
28
Light Dimmer
29
Lamp & Fan in Parallel
30
Hear the Motor
31 Hear the Motor with Light
32
Listen to the Light
33
Two-Speed Fan
34
Prismatic Film
-9-
10
10
11
11
12
12
12
13
13
14
14
14
15
15
15
15
15
16
16
16
17
17
18
18
18
18
19
19
19
20
20
21
21
22
Project #
Description
Page #
35
Prismatic LED
36
Look at the Lights
37
Scattering Light
38
Power Shifter
39
Spin Sound
40
Loud Spin Sound
41
Nifty Noises
42
Loud Nifty Noises
43
Photo LED Control
44
Fuse
45
Mind Reader Game
46
Wave & Watch
47
Reflection Detector
48
Shine on Siren
49
Shooting Sounds
50
Song & Siren
51
Ambulance Melody
52
Static Song
53
Mixed Up Music
54
Blaster Disaster
55
Siren & Song
56
Ambulance Song
57
Space Battle
58
Bizarre Blinker
59
Periodic Sounds
60 Blinking Double Flashlight
61 Motor-Controlled Sounds
62
Spin & Shoot
63
Spin Out Siren
64
Whirl Out Warning
65
Turn a Tune
66
Spinning Rings
67 Strobe the House Lights
68
Race Game
22
22
22
22
23
23
23
23
24
24
25
26
26
27
27
27
27
27
28
28
28
28
29
29
29
29
30
30
30
30
30
31
31
32
Project #
Description
Page #
69 Using Parts as Conductors 32
70
Spin Draw
33
71
Singing Motor
33
72
Visual Volume
34
73
Eurosiren Volume
34
74
Funky Volume
34
75
Fire-Light Siren
34
76
Crooks & Cars
34
77
Static Gun
34
78
Pop On, Pop Off
35
79
Craszy Combo
35
80
Alien Alarm
35
81
Two-way Light Switch
36
82
Machine Gun Buzz
36
83 Double Flash Machine Gun 36
84
Light Makes Light
37
85
Go & Glow
37
86
Same or “NOT”
37
87
This OR That
38
88
This AND That
38
89
Neither This NOR That 39
90
NOT This AND That
39
91
Music AND Gate
40
92
Touch & Go
40
93
Flash & Tone
40
94
Fan FLash Energy
41
95
Fun with the Alarm IC 41
96
Music Alarm Combo 42
97
Hit the Target
42
98
Water Space War
42
99
Light / Water Space War 42
OR / AND Space War Light 42
100
101
Sing & Fling
43
102
Power Pitch
43
103
Morse Code
44
Project #
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
Description
Page #
Motor Space Sounds
Twist & Blink
Light-controlled Lamp
Motor-controlled Lamp
Multi- Speed Light Fan
Light Disrupter
Alarm Circuit
Machine Gun
Fire Engine
European Siren
Quieter Alarm Circuits
Quieter Machine Gun
Quieter Fire Engine
Quieter European Siren
Pencil Alarm
Pencil Sound
Pencil Alarm Variant
Another Pencil Alarm Variant
Simple Water Alarm
Simple Salt Water Alarm
Ambulance Water Alarm
Ambulance Contact Alarm
Symphony of Sounds
Photo Symphony of Sounds
Incandescent Symphony of Sounds
Siren Symphony of Sounds
Machine Gun Symphony of Sounds
Euro SirenSymphony of Sounds
2-Light Symphony of Sounds
Super Symphony of Sounds
45
45
45
45
46
46
47
47
47
47
47
47
47
47
48
48
48
48
49
49
49
49
50
50
50
50
50
50
51
51
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Project 1
Electric Light
Snappy says when you turn on the slide switch,
electricity flows from the batteries through the
lamp and back to the battery through the switch.
If the switch is off, the flow of electricity is
blocked, and the lamp won’t light.
Build the circuit shown on the left
by placing all the parts with a black
1 next to them on the board first.
Then, assemble parts marked with
a 2. Install two (2) “AA” batteries
(not included) into the battery
holder (B1) if you have not done so
already.
Placement Level Numbers
Project 2
Turn on the slide switch (S1), and
Turn on the slide switch (S1), and enjoy
the light show from the color LED (D8).
For best effects, place the egg on the
color LED, and dim the room lights.
Try reversing the position of the slide
switch (S1), 100W resistor (R1), and
color LED (D8), separately. Reversing
the switch and resistor has no effect, but
the LED does not work in reverse.
+
Snap Circuits® uses electronic
blocks that snap onto a clear
plastic grid to build different
circuits. These blocks have
different colors and numbers on
them so that you can easily identify
them.
Color Light
Snappy says the color LED actually
contains separate red, green, and blue
lights, with a micro-circuit controlling
them.
LEDs are like valves, because they only
let electric current flow in one direction.
Egg LED
attachment
-10-
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Project 3
Placement Level Numbers
Motor Controlled Sounds & Light
+
Optional:
Build the circuit shown on the left by placing
all the parts with a black 1 next to them on
the board first. Then, place parts marked
with a 2, and then parts with a 3. Install two
(2) “AA” batteries (not included) into the
battery holder (B1) if you have not done so
already. If desired, place the egg on the
color LED (D8).
Turn on the slide switch (S1). The color
LED lights and you hear a siren for a few
seconds, then they stop. Spin the motor
(M1) top with your fingers to re-start the
sound and LED. Also, push the press
switch (S2) to light the lamp (L1).
Project 4
+
-11-
You can change the siren sound by shining
a bright light on the phototransistor (Q4), or
covering it if the room light was already
bright.
Light Controlled Color Light
Turn on the slide switch (S1). Vary the
amount of light shining on the
phototransistor (Q4) to change the
brightness of the color LED (D8).
The phototransistor (Q4) uses
light to control electric current.
Parts like this are used in a
number of ways that affect our
lives. For example, you may have
streetlights in your neighborhood
that turn on when it starts getting
dark and turn off in the morning.
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Project 5
Project 6
Musical Doorbell
Turn on the slide switch
(S1). A tune may play for a
sort time and then stop.
When there is no sound,
push the press switch (S2)
to play a tune. The press
switch acts like a musical
doorbell.
Music Circuit
Build the circuit
shown on the left.
Turn on the switch
(S1). A tune plays
for a short time and
then stops. Push
the press switch
(S2) and music
plays until you
release S2. Spin
the motor (M1) top
with your fingers to
play a short tune.
The lower-right snap of the music IC is like
an electrical gate, opening and closing
quickly to let small bursts of electric current
flow in. The bursts of electric current also
flow through the speaker (which produces
sound). The music IC produces the tune by
adjusting the pattern of current bursts
through the speaker.
Musical integrated circuits are used
to entertain young children in many
of the toys and chairs made to hold
infants. If the music is replaced with
words, the child can also learn while
they are entertained. Because of
great advances in miniaturization,
many songs are stored in a circuit
no bigger than a pinhead.
Project 7
Space War
Alarm Combo
Build the circuit
shown. Turn on the
slide switch (S1),
press the press
switch (S2) several
times, and cover
and uncover the
phototransistor (Q4)
to hear all the sound
combinations.
-12-
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Project 8
If the fan doesn’t fly off, then press the switch several times
rapidly when it is at full speed. The motor spins faster when
the batteries are new.
Placement Level Numbers
The air is being blown down through
the blade and the motor rotation
locks the fan on the shaft. When the
motor is turned off, the blade
unlocks from the shaft and is free to
act as a propeller and fly through the
air. If speed of rotation is too slow,
the fan will remain on the motor
shaft because it does not have
enough lift to propel it.
The glow fan will glow in the dark. It will glow best after
absorbing sunlight for a while. The glow fan is made of plastic,
so be careful not to let it get hot enough to melt. The glow looks
best in a dimly lit room.
WARNING: Moving parts. Do not touch the fan or motor during operation.
Do not lean over the motor. Fan may not rise until switch is released.
Project 9
+
-13-
Build the circuit shown on the left by placing all the parts with
a black 1 next to them on the board first. Then, assemble parts
marked with a 2. Install two (2) “AA” batteries (not included)
into the battery holder (B1) if you have not done so already.
Push the press switch (S2) until the motor reaches full speed,
then release it. The fan blade should rise and float through the
air like a flying saucer. Be careful not to look directly down on
fan blade when it is spinning.
+
!
Flying Saucer
Use the preceding circuit, but
reverse the position of the motor
(M1). Push the press switch (S2)
to spin the motor and glow fan.
!
Fan
Here the glow fan is blowing air upward; place your hand a
short distance above the motor and you should be able to
feel it.
In this project electrical power was changed into mechanical
power. Motors like this one are used in battery powered
equipment requiring rotary motion, such as a cordless drill,
electric toothbrush, and toys. An electric motor is much
easier to control than gas or diesel engines.
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
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Project 10
+
+
Turn on the slide switch (S1) to make sound
and lights. Some of the sound may stop after
a few seconds; if it does, shine a bright light
on the phototransistor (Q4) to re-start the
sound. If the sound never shuts off then cover
the phototransistor. (you may need to smother
Q4 with your hand or take the circuit into a
dark room).
Push the press switch (S2) until the motor
reaches full speed, then release it. The fan
blade should rise and float through the air like
a flying saucer. Be careful not to look directly
down on fan blade when it is spinning.
Optional:
If the fan doesn’t fly off, then press the switch
several times rapidly when it is at full speed.
The motor spins faster when the batteries are
new. If you don’t want the fan to fly off then
reverse the orientation of the motor.
Placement Level Numbers
!
Super Circuit
WARNING: Moving parts. Do not touch the fan or motor during operation.
Do not lean over the motor. Fan may not rise until switch is released.
Project 11
Another Super Circuit
To change the sound, move the 2-snap
wire that is on top of the alarm IC (U2)
one space to the right.
This circuit is shown
on the front of the
Snap Circuits® Select
box, use that picture
to help in building it.
Project 12
Yet Another Super Circuit
To change the sound, remove the 2-snap
wire that is on top of the alarm IC (U2).
-14-
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Project 13
European Siren & Light
The lower-right snap of the alarm IC (U2) is like an
electrical gate, opening and closing quickly to let small
bursts of electric current flow in. The bursts of electric
current also flow through the color LED (lighting it) and
the speaker (which produces sound). The alarm IC
produces the different siren sounds by adjusting the
pattern of current bursts through the speaker.
Turn on the slide
switch (S1). A
European siren
sounds and the
color LED (D8)
flashes.
Project 14
Siren & Light
Modify the project 13 circuit by
removing the 2-snap wire and
1-snap wire that are on top of
the alarm IC (U2), as shown.
-15-
Project 15
Silly Sound &
Light
Modify the preceding circuit by
removing the 3-snap wire that
is on top of the alarm IC (U2),
and adding three 2-snap wires
around it, as shown.
Project 16
Fire Engine
Siren & Light
Modify the project 13 circuit by
moving the 2-snap wire that is on
top of the alarm IC (U2), as shown.
Project 17
Machine Gun
Sound & Light
Modify the project 13
circuit by moving the 2snap wire and 1-snap wire
that are on top of the
alarm IC (U2), as shown.
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Project 18
Project 19
+
Conduction Detector
Build the circuit as shown. When you
place a metal paper clip across the snaps
on the red & black wires as shown in the
drawing, current flows from the batteries
(B1) through the resistor (R1), through the
paperclip, through the color LED (D8),
and back to the battery. The paper clip
completes the circuit and can current flow
through the LED.
Materials that have low
resistance to the flow of
electricity
are
called
conductors, and materials that
have high electrical resistance
are called insulators.
Now replace the metal paperclip with
other materials in your home, and see if
the LED lights. This circuit can be used to
see if a material like plastic is a good
conductor of electricity, or a poor
conductor of it.
Light Controlled
Music
Turn on the slide switch (S1) and
you hear a tune. The sound may
stop after a few seconds; if it does,
shine a bright light on the
phototransistor (Q4) to turn the
sound back on. If the sound never
shuts
off
then
cover
the
phototransistor. (you may need to
smother Q4 with your hand or take
Project 20
Finger
Controlled
Music
Use the preceding circuit,
but
replace
the
phototransistor (Q4) with
the press switch (S2). Turn
on the slide switch (S1). A
tune may play for a short
time and then stop. When
there is no sound, push the
press switch (S2) to hear
music; if you release S2
then the music stops.
-16-
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Project 21
Space War
Build the circuit shown on the left, which
uses the space war IC (U3). Activate it by
flipping the slide switch (S1) or pressing the
press switch (S2); do both several times and
in combination. You will hear an exciting
range of sounds, as if a space war is raging!
Like the other integrated circuits, the
space war IC is a super-miniaturized
electronic circuit that can play a
variety of cool sounds stored in it by
using just a few extra components.
The upper-right snap of the space
war IC is like an electrical gate,
opening and closing quickly to let
small bursts of electric current flow
in. The bursts of electric current also
flow through the speaker (which
produces sound). The space war IC
produces the different sounds by
adjusting the pattern of two
separate current bursts through the
speaker.
In movie studios, technicians are paid
to insert these sounds at the precise
instant a gun is fired. Try making your
sound occur at the same time an
object hits the floor. It is not as easy
as it sounds.
Project 22
Photo Space War
Use the preceding circuit, but replace the slide switch (S1) with the
phototransistor (Q4), with “+” toward U3. The circuit immediately makes noise
(unless the room is very dark). Cover and uncover the phototransistor to
change the sound, or push the press swtch (S2). Do both several times and
in combination.
Note: the phototransistor is very sensitive, and even a small amount of light
may be enough for it to activate the space war IC. You may need to be
covering/uncovering the phototransistor in a relatively dark room.
-17-
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Project 23
Super Space War
Build the circuit shown on the left. Activate it by
flipping the slide switch (S1) or pressing the
press switch (S2); do both several times and in
combination. You will hear an exciting range of
sounds plus light, as if a space war is raging!
Project 25
Quieter Super
Space War
This circuit is just like project 23, but not as
loud. Activate it by flipping the slide switch
(S1) or pressing the press switch (S2); do
both several times and in combination.
Project 24
Super Photo
Space War
Use the preceding circuit, but
replace the slide switch (S1)
with the phototransistor (Q4),
with “+” toward U3. The circuit
immediately makes noise
(unless the room is vary dark),
and the color LED (D8) lights.
Cover and uncover the
phototransistor to change the
sound, or push the press swtch
(S2). Do both several times and
in combination.
Project 26
Quieter Super
Photo Space War
Use the preceding circuit, but
replace the slide switch (S1)
with the phototransistor (Q4),
with “+” toward U3. The circuit
immediately makes noise
(unless the room is vary dark),
and the color LED (D8) lights.
Cover and uncover the
phototransistor to change the
sound, or push the press swtch
(S2). Do both several times
and in combination.
-18-
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Project 27
Lamp & Fan in Series
Turn on the slide switch
(S1). The lamp (L1)
lights and the motor
(M1) spins the glow fan.
Notice how the lamp
gets a little less bright as
the motor speeds up.
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Project 29
+
Project 28 Light Dimmer
Use the preceding circuit, but remove the glow
fan from the motor (M1). Turn on the slide switch
(S1), and watch how the lamp (L1) starts out
bright, but gets dim as the motor speeds up.
Next, turn off the circuit and hold the motor top
with your fingers so it can’t spin, then turn on the
switch and see how bright the lamp is.
The faster the motor is spinning,
the less electricity it needs. The
more electricity flows, the brighter
the lamp gets. The motor needs
the most electricity when it starts
up, making the lamp brightest.
Without the fan, the motor can
spin fast and needs little
electricity, making the lamp dim.
Lamp & Fan in Parallel
Turn on the slide switch
(S1). The lamp (L1) lights
and the motor (M1) spins
the glow fan.
Compare this circuit to the
circuit in project 27, and
also try removing the fan
as done in project 28.
Notice how the lamp
brightness is not affected
by the motor speed, and
the motor starts a little
-19-
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Here the motor and lamp are
connected in parallel. Each has its
own path to the batteries, so they
don’t affect each other.
An advantage of connecting parts
in parallel is that if one of them
burns out, the other will still work.
The switch is connected in series
with both the lamp and motor, so if
it breaks, nothing will work.
Electricity flows out of the batteries,
through either the motor or lamp,
then back to the batteries through
the switch.
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Project 30
Hear the Motor
Turn on the slide switch
(S1). If the shaft on the
motor
(M1)
isn’t
spinning, then give it a
push to get started.
Listen to the motor.
You can also try this
circuit with the glow fan
on the motor.
Project 31
3
Why does the motor make
sound? A motor uses
magnetism
to
convert
electrical
energy
into
mechanical spinning motion.
As the motor shaft spins
around
it
connects/
disconnects several sets of
electrical contacts to give the
best magnetic properties. As
these contacts are switched,
an electrical disturbance is
created, which the speaker
Hear the Motor with Light
Turn on the slide switch (S1),
and look at the brightness of the
color LED (D8). If the shaft on
the motor (M1) isn’t spinning,
then give it a push to get
started. Try it three ways: with
no fan on the motor, with the
glow fan on the motor, and
keeping the motor from
spinning with your fingers.
When the motor is spinning,
you will hear noise from the
speaker (SP).
The motor needs a lot of electricity to start
spinning, but needs less the faster it is
spinning. When kept from spinning by your
fingers, the motor sucks up all the
electricity, leaving none to light the color
LED. With the fan on the motor, the LED
gets enough electricity to light. When the
motor is spinning without the fan, the LED
gets more electricity and is brighter.
-20-
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Project 32
Listen to the Light
Turn on the slide switch (S1).
The color LED (D8) changes
colors in a repeating pattern,
and you hear a clicking sound
from the speaker (SP2).
Project 33
Two-Speed Fan
Turn on the slide switch (S1);
the motor (M1) spins the glow
fan and the lamp (L1) lights.
Push the press switch (S2) to
bypass the lamp and increase
the fan speed.
-21-
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
What makes the clicking sound? The
color LED actually contains separate red,
green, and blue lights, with a microcircuit
controlling them. Each time the LED
changes colors, the voltage across it
changes. Each time the voltage
changes, you hear a “click” from the
speaker.
When the lamp is on, the fan
spins slower because the battery
power is divided between the
motor and lamp. Pushing S2
allows electricity to bypass the
lamp, so all the battery power is
available to the motor, so the fan
spins faster.
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Project 34
Prismatic Film
Project 35
Prismatic LED
Prismatic
film
separates light into
different colors. White
light is a combination
of all colors.
This is the same circuit as project 1, but
you will view it differently. Turn on the
switch (S1), and view the lamp (L1)
through the prismatic film (the clear
slide). Prismatic film makes interesting
light effects.
Project 37
Scattering Light
Use the project 34
and 35 circuits, but
view the lamp and
color LED through
various
semitransparent
liquids, glassware,
and
plastics.
Juices, jello, and
cloudy glass or
plastic work well.
Semi-transparent
materials scatter
the light without
completely
blocking it, so a
wide area of the
liquid or material
is lit up by the
light.
This
happens in the
egg
LED
Project 36
Look at the
Lights
View different light sources in
and around your home
through the prismatic film.
This is the same circuit as project 2, but
you will view it differently. Turn on the
switch (S1), and view the LED through
the prismatic film (the clear slide).
Prismatic film makes interesting light
Project 38
Power Shifter
When you turn on
the slide switch
(S1), the color LED
(D8) is on and the
lamp (L1) is off.
Push the press
switch
(S2)
to
bypass the LED.
The lamp turns on
and the LED turns
off. This shows how
switches can be
used to shift power
between different
devices.
-22-
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Project 39
Spin Sound
Build the circuit shown on the right, but leave the fan off the
motor (M1). When you turn on the slide switch (S1), the music
may play for a short time and then stop. After the music has
stopped, spin the motor with your fingers. The music should play
again for a short time, then stop.
Use the preceding circuit but
replace the 100W resistor
with a 3-snap wire. Now the
sound is louder. In this project,
you changed the amount of
current that goes through the
speaker (SP2) and increased
the sound output of the speaker.
Resistors are used
throughout electronics
to limit the amount of
current that flows.
Project 41
Build the circuit shown. Turn it on, press the
press switch (S2) several times, and cover the
phototransistor (Q4) several times to hear all the
sound combinations.
A photoresistor is a light-controlled
variable resistor. The resistance of the
photoresistor
decreases
with
increasing light intensity.
-23-
Project 40
Loud Spin
Sound
Nifty Noises
Project 42
Loud Nifty
Noises
Use the preceding circuit
but make the sound from
the alarm IC (U2) louder by
replacing the 100W resistor
(R1) with the 2.5V lamp
(L1).
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Project 43
Photo LED Control
Build the circuit shown on the left. Cover the phototransistor
(Q4) and turn on the switch (S1); the color LED (D8) should be
changing colors.
Now shine a bright light on the phototransistor and the color
LED should get dim or turn off. Vary the amount of light on the
phototransistor and see how bright the color LED is. Try using
a flashlight in a dimly lit room.
Project 44
Pretend the 3-snap wire marked fuse in the
drawing on the left is a device that will open the
circuit if too much current is taken from the battery.
When you close the slide switch (S1), current
flows from the batteries through the slide switch
(S1), the lamp (L1), motor (M1), and back to the
battery (B1). When press switch (S2) is closed,
the light is shorted and motor speed increases due
to an increase in current to the motor. While still
holding press switch (S2) down, remove the 3snap wire marked fuse and notice how everything
stops. Until the fuse is replaced, the open circuit
path protects the electronic parts. If fuses did not
exist, many parts could get hot and even start
fires. Replace the 3-snap wire and the circuit
should return to normal.
!
Fuse
Many electronic products in
your home have a fuse that will
open when too much current is
drawn. Can you name some?
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
-24-
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Project 45
Build the circuit below. It uses the red jumper
wire and a 3-Snap Wire as “shorting bars”.
Setup: Player 1 sets the target by placing the 3snap shorting bar under the paper on column 2,
3 or 4. Player 2 must NOT know where the
shorting bar is located under the paper.
A
Paper Sheet to
hide position of
shorting bar
-25-
B
Mind Reader Game
The object is for Player 2 to guess the location
by placing the loose end of the red jumper wire
on the 5-snap wire at positions A, B, or C and
then pressing the press switch (S2). If Player 2
places the red jumper wire at the correct position,
the sounds played indicates a “hit”. He keeps
guessing until he hits. After each hit, remove the
3-snap shorting bar and slide the switch off and
C
on to reset the sound.
Player 2 then sets the 2, 3, 4 side and player 1
tries his luck.
Play multiple rounds and see who gets the best
overall score. The winner will be the player who
is best at reading his opponent’s mind.
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Project 46
Wave & Watch
2
This circuit does not use the noisy speaker (SP2) but instead uses
a nice quiet color LED (D8). Turn on the slide switch (S1), the LED
flickers. Wait a few seconds, and then cover the phototransistor
(Q4), and the flicker stops. The flicker is controlled by the
photoresistor; uncover it and the flicker resumes.
People that are deaf need lights to tell them
when a doorbell is ringing. They also use
circuits like this to tell them if an alarm has
been triggered or an oven is ready.
Can you think of other uses?
Project 47
Reflection Detector
Build the circuit to the right. Place it where there won’t
be any room light hitting the phototransistor (Q4) (such
as in a dark room or under a table), and then turn it on.
The 2.5V lamp (L1) will be bright, and one song may
play, but then there should be no sound.
Take a small mirror and hold it over the lamp and
photoresistor. You should hear sound now. You have a
music reflection detector! You can also use a white
piece of paper instead of a mirror, since white surfaces
reflect light.
Note: the motor (M1) will not spin. It is used here to
block light from going directly from the lamp to the
phototransistor.
1
3
-26-
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Project 48
x
Y
A
B
Shine On Siren
Cover the phototransistor (Q4) and turn on the switch (S1). A police
siren is heard for a while and stops, then you can control it by covering
or uncovering the photoresistor.
C
D
Project 49
Shooting
Sounds
Use the preceding circuit,
but add a connection
between
the
points
marked B & C using a 1snap and a 2-snap. Now it
sounds like a machine
gun.
-27-
Project 50
This circuit demonstrates how
sounds can be synchronized
to light patterns through the
photoresistor.
Project 51
Project 52
Song &
Siren
Ambulance
Melody
Static Song
Use the preceding circuit,
but remove the connection
between B & C, and add a
connection between A &
B. Now it sounds like a fire
engine
Use the preceding circuit,
but remove the connection
between A & B, and add a
connection between A &
D. Now it sounds like a
European siren.
Now remove the connections
between A & D and between
Y &B, then make a connection
between X & A. The circuit
works the same way but now
it sounds like a familiar song
but with static.
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Project 53
Mixed Up Music
In the circuit, the outputs from the alarm and
music ICs are connected together. Build the
circuit shown and then place the alarm IC (U2)
directly over the music IC (U1), resting on two
1-snaps and a 2-snap. Turn on the switch (S1)
and you will hear a siren and music together
while the lamp (L1) varies in brightness.
Snappy says there sure are a lot of different
sounds that can be made with the music and
alarm ICs.
Project 54
Project 55
Blaster Disaster
Siren & Song
Modify the last circuit by connecting points Y &
Z with a 2-snap (on level 5). The circuit works
the same way but now it sounds like a machine
gun with music.
Now remove the 2-snap connection between Y
& Z and then make a 2-snap connection
between X & Y (on level 5). The circuit works
the same way but now it sounds like a fire
engine with music.
Project 56
Ambulance Song
Now remove the 2-snap connection between X
& Y and then make a 2-snap connection
between W & X (on level 5). The circuit works
the same way but now it sounds like an
ambulance with music.
-28-
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Project 57
Project 58
Bizarre
Blinker
Space Battle
Build the circuit shown on
the left. Turn on the
switch (S1) and you will
hear exciting sounds, as
if a space battle is raging!
Project 59
Periodic Sounds
Build the circuit shown on the left and turn
it on. The lamp (L1) alternates between
being on and off while the speaker (SP2)
alternates between two musical tones...
like someone is flipping a switch, but at a
very consistent rate. Periodic signals like
this are very important in electronics.
Periodic electrical
signals are used for
things like flashing
yellow lights or
sometimes
in
consumer devices
to indicate batteries
are low.
-29-
The preceding circuit is loud and
may bother people around you, so
replace the speaker (SP2) with the
color LED (D8, “+” on top and away
from U3).
Project 60
Blinking Double
Flashlight
In the circuit at left, replace the speaker
(SP2) with the color LED (D8). Make sure
you connect the color LED with the positive
(+) side on A5, not U1. The lamp (L1)
alternates between being on and off while
the color LED alternates between being
dimmer and brighter.
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Project 61
T
V
x
U
W
Y
Motor-Controlled Sounds
This circuit is controlled by spinning the motor (M1) with your
hands. Turn on the switch. A police siren is heard and then stops.
Spin the motor and it will play again. Note, however, that music
can be heard faintly in the background of the siren.
Z
Project 62
Project 63
Project 64
This project shows how a motor can be
used to convert mechanical energy to
electrical energy and sound. The
speaker uses electromagnetism to
create changes in air pressure, which
your ears feel and interpret as sound.
Think of the speaker as creating
pressure waves in the air just like
waves in a pool. You only see waves in
the pool when you disturb the water, so
the speaker only makes sound when
the voltage changes.
Project 65
Spin &
Shoot
Spin Out
Siren
Whirl Out
Warning
Turn a
Tune
Modify the last circuit by
connecting points X & Y with the
2.5V lamp (L1). The circuit works
the same way but now it sounds
like a machine gun.
Now remove the connection
between X & Y and then make a
connection between T & U with
the 2.5V lamp (L1). The circuit
works the same way but now it
sounds like a fire engine.
Now remove the connection
between T & U and then make a
connection between U & Z. The
circuit works the same way but
now it sounds like an ambulance.
Now remove the connections
between U & Z and between V &
W, then make a connection
between T & U. The circuit works
the same way but now it sounds
like a familiar song but with static.
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Project 66
Spinning Rings
Setup: Cut out the disc on page #52 that looks
like the one shown here. Using Scotch tape,
attach the disc with the printed side up on the top
of the fan blade. Place the blade on the motor as
shown to the left and below.
When the press switch (S2) is pressed, the arcs
will turn into colored rings with a black
background. Notice how the color drops in
brightness when it is stretched to make a
Project 67
Place the spinning rings under a fluorescent light with a T12 bulb (1.5”
diameter) that runs on normal house current. Start the disc spinning
and release the press switch (S2). As the speed changes you will notice
the white lines first seem to move in one direction then they start
moving in another direction.
-31-
!
WARNING: Moving parts. Do not touch the fan or
motor during operation.
Strobe the House Lights
This effect is because the lights are blinking 120
times a second and the changing speed of the
motor is acting like a strobe light to catch the
motion at certain speeds. To prove this, try the
same test with a flashlight. The light from a
flashlight is constant and if all other lights are out,
you will not see the effect that looks like a
helicopter blade in a movie. This does not work
with newer fluorescent lights, because they use
an electronic ballast and produce a constant
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Project 68
Modify the preceding project by adding the pointer as shown on the left. The paper should be
cut from page #52 and taped high enough on the speaker so the pointer will stick over the fan
with paper. Bend the pointer at a right angle as shown on the left.
Setup: Cut out the grid with four (4) colors from page #52 and place it under the base as shown
on the left. Each player picks a color (or two colors if only 2 people are playing) and places a
single snap on row G. The purple player in column 1, the blue player in column 2, the green
player in column 3, and the yellow player in column 4. Spin the wheel by closing the press
switch (S2). The first single color wedge that the pointer points to is the first player to start. In
some models you only have three 1-snaps, so use a 2-snap if you have four players.
The Play: Each player gets a turn to press the press switch. They release the press switch
and when the pointer points to a wedge, the players that match the colors on the wedge get
to move up one space. If a liner comes up like the one shown on the left then the players on
each side of the line get to move up two (2) spaces. The first player to reach the top row (A)
wins. If two players reach the top row at the same time they must both drop down to row “D”
and play continues.
!
WARNING:Moving parts. Do not touch the
fan or motor during operation.
Project 69
Race Game
2
Cut this shape from page 56
and tape it to the speaker.
Using Parts as Conductors
Turn on the slide switch (S1) and push the press switch
(S2), you hear space war sounds. After a while the
sound may stop, shine light on the phototransistor (Q4)
to make the sound resume.
Note that the color LED (D8) lights,
but the lamp (L1) does not light and
the motor (M1) does not spin.
Electricity is flowing through the lamp
and motor, but not enough to turn
them on. So in this circuit they are
acting like 3-snap wires. You could
replace D8 or L1 with a 3-snap and
the circuit would work the same.
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Project 70
Spin Draw
Rebuild the simple motor connection as shown on the left. This is the same setup as Project 66.
Setup: Cut out a circular piece of thin cardboard from the back of an old spiral notebook or note
pad. Use the fan blade as a guide. Place the fan on the cardboard and trace around it with a pencil
or pen. Cut the cardboard out with scissors and tape it to the fan blade. Do the same thing with a
piece of white paper, but tape the paper on top of the cardboard so it can be removed easily later.
Drawing: To make a ring drawing obtain some thin and thick marking pens as drawing tools. Spin
the paper by pressing and holding press switch (S2) down. Press the marker on the paper to form
rings. To make spiral drawings, release press switch (S2) and as the motor approaches a slow
speed move the marker from the inside outward quickly.
Project 71
Change the colors often and avoid using too much black to get hypnotic effects. Another method is
to make colorful shapes on the disc then spin the disc and watch them blend into each other. When
certain speeds are reached under fluorescent lights without electronic ballasts, the strobe principle
shown in another project will produce strange effects and backward movement. Make a wheel with
different colored spokes to see this strange effect. Adding more spokes and removing spokes will
give different effects at different motor speeds.
Singing Motor
Turn on the switch and the motor spins (you may need to give it a
push with your finger to get it started). The sounds from the IC are
used to drive the motor. Because the motor uses magnets and a coil
of wire similar to a speaker, you may even hear the space war
sounds coming faintly from the motor.
The motor has a coil and a magnet similar to the
speaker. An electrical signal in the coil creates a
magnetic field, which makes the shaft spin.
Normally the motor is used with a stable
electrical signal, but in this project it is used with
a changing signal from the space war IC. This
creates mechanical vibrations, which create air
pressure variations that sound like the speaker
does, though not as efficiently.
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Project 72
A
B
C
x
Y
Z
Visual Volume
Build the circuit shown on the left.
Turn on the slide switch (S1), a police siren is heard. The loudness of
the sound depends on how much light reaches the phototransistor (Q4).
Try partially shielding it or placing near a very bright light, and compare
the sound.
The phototransistor contains material that
changes its resistance when it is exposed to
light. As it gets more light, the resistance of the
phototransistor decreases. Parts like this are
used in a number of ways that affect our lives.
For example, you may have streetlights in your
neighborhood that turn on when it starts getting
dark and turn off in the morning.
Q
Project 73
Eurosiren Volume
Modify the last circuit by connecting points
X & Q using a 1-snap wire and a 2-snap
wire. Now you hear a European siren when
enough light reaches the phototransistor.
Project 74
Funky Volume
Now remove the connection between points
X & Q, and shift the phototransistor to points
A & X. Now you hear a strange sound when
enough light reaches the phototransistor.
Project 75
Fire-Light
Siren
Now add a 3-snap wire
between B & Y. Now you
hear a siren, which
changes to a fire engine
sound when enough light
reaches the phototransistor.
Project 76
Crooks &
Cars
Now shift the phototransistor to
points C & Z, Now depending on
how much light reaches the
phototransistor,
you
will
heareither a police siren or
Project 77
Static Gun
Now shift the 3-snap wire
from points B & Y to points A
& X. The circuit works the
same
way
but
now
depending on how much
light
reaches
the
phototransistor you will hear
either a machine gun
sound or a different sound.
-34-
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Pop On, Pop Off
Project 78
Turn the slide switch (S1)
on and off several times.
You hear static from the
speaker (SP2) when you
turn the switch on or off.
Project 79
Crazy Combo
Build the circuit shown. Turn it on, press the press switch (S2) several
times, and wave your hand over the phototransistor to hear all the sound
combinations. You can make the sound from the music IC louder by
replacing the 100W resistor (R1) with the 2.5V lamp (L1).
-35-
The speaker uses electromagnetism to create
changes in air pressure, which your ears feel
and interpret as sound. Think of the speaker
as creating pressure waves in the air just like
waves in a pool. You only see waves in the
pool when you disturb the water, so the
speaker only makes sound when the voltage
changes.
Project 80
Alien Alarm
Build the circuit shown on the left and turn on the slide switch (S1).
Press and hold the press switch (S2) to make the lamp (L1) brighter.
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Project 81
Two-way Light Switch
Build the circuit on the left. Note that two of the 2-snaps are left
unconnected on one end because they will be used as switches in this
project. If you connect the free ends of each of these 2-snaps both to
the “high bar” or positions B in the figure or both to the “low bar” or
positions A in the figure, the color LED (D8) lights up. But if you connect
the free end of one of the 2-snaps to the “high bar” and the free end of
the other 2-snap to the “low bar”, then the color LED does not light up.
Project 82
A
B
Machine Gun Buzz
Build the circuit shown on the left. Turn
on the switch (S1) and you hear a
machine gun and a buzzing sound,
while the color LED (D8) is changing
Project 83
Double Flash
Machine Gun
Use the preceding circuit, but
add the lamp (L1) across the
points marked A & B, on level 4.
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Project 84
A
Light Makes Light
Build the circuit to the left. Cover the phototransistor (Q4), turn the switch
on, and notice that the color LED (D8) is on for several seconds and then
goes off. Uncover the photoresistor and place the unit near a light and the
LED will light. Cover the phototransistor again and the LED will turn off. The
resistance of the photoresistor decreases as the light increases activating
the U1 IC that varies the voltage to the LED making it light.
Project 85
Go & Glow
B
2
Project 86
Use the proceding circuit, but connect the motor (M1) across points A
and B on the base grid, and remove the phototransistor (Q4). Turn the
switch on and the color LED (D8) lights for several seconds then goes
out. Turn the shaft of the motor and the LED will light again. As the
motor turns, it produce a voltage. There is a magnet and a coil inside
the motor. When the axis turns the magnetic field will change and
generate a small current through its terminals. This voltage then
activates the music IC.
Same or “NOT”
Build the circuit shown. Notice that when the press switch (S2) is pressed, the
color LED (D8) goes off. This is an example of an inverter circuit, or NOT gate.
Whenever the input is high (switch is on), the output is low (LED is off) and
whenever the input is low (switch is off) the output is high (LED is on).
Disassemble the circuit when finished to avoid draining your batteries.
Although this circuit seems simple,
inverters or NOT gates are very
important in digital logic circuits.
-37-
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Project 87
Project 88
This OR That
Build the circuit shown. Notice that if you turn on the slide switch (S1)
OR press the press switch (S2) the color LED (D8) lights up. There is
no partially lit state here, the diode is either totally on or totally off. While
this may seem very simple and boring, it represents an important
concept in electronics. Two switches like this may be used to turn on a
light in your house, or they might be two sensors at a railroad crossing
used to start the ding-ding sound and lower the gate. You could also
have more than two switches and the circuit would function the same
This circuit is commonly called an OR gate.
OR gates are used in digital logic circuits to
perform logical additions. When one of the
inputs is high (one of the switches is on) the
output is high (LED on). The output will only
be low (LED off) if both inputs are low (both
switches are off).
This AND That
Build the circuit shown. Notice that if you turn on the slide switch (S1)
AND press the press switch (S2) the color LED (D8) lights up. Once
again, there is no partially lit state here, the LED is either totally on or
totally off. Two switches like this may be used to turn on the same light
in your house, the room switch and the master switch in the electrical
box. You could also have more than two switches and the circuit would
function the same way.
This circuit is commonly called an AND gate. AND gates
are used in digital logic circuits to perform logical
multiplies. When one of the inputs is low (one of the
switches is off) the output is low (LED off). The output
will only be high (LED on) if both inputs are high (both
switches are on). Combinations of AND and OR circuits
are used to add and multiply numbers together in
modern computers. These circuits are made of tiny
transistors in massive integrated circuits.
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Project 89
Neither This NOR That
Build the circuit at left and test the combinations of the slide switch (S1)
and press switch (S2). If you compare it to the OR circuit in Project #82,
you can see the color LED (D8) lights in the opposite combinations of
that circuit. Hence, we refer to it as a NOR circuit (short for “NOT this
OR that”). Like the OR and AND, it is an important building block in
computers.
This circuit is commonly called a NOR gate. NOR
gates are used in digital logic circuits to perform
an inverted logical add. When one of the inputs is
high (one of the switches is on) the output is low
(LED off). The output will only be high (LED on) if
both inputs are low (both switches are off).
Project 90
-39-
NOT This AND That
Build the circuit at left and test the combinations of the slide switch (S1)
and press switch (S2). If you compare it to the AND circuit in Project
#83, you can see the color LED (D8) lights in the opposite combinations
of that circuit. Hence, we refer to it as a NAND circuit (short for “NOT
this AND that”). This circuit can also have more or less than two inputs,
though when it only has one input it is referred to as a NOT circuit. Like
the OR, AND, and NOR, NAND and NOT are important building blocks
in computers.
This circuit is commonly called a NAND gate.
NAND gates are used in digital logic circuits to
perform an inverted logical multiply. When one of
the inputs is low (one of the switches is off) the
output is high (LED on). The output will only be
low (LED off) if both inputs are high (both switches
are on).
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Project 91
Music AND Gate
You will only hear music
if you turn on the slide
switch (S1) AND press
the press switch (S2).
This is referred to as an
AND gate in electronics.
This concept is important
in computer logic.
Example: If condition X
AND condition Y are
true,
then
execute
instruction Z.
Project 93
Project 92
Touch & Go
Wet your fingers with some
water or saliva and touch
them across points A and B
several times to hear some
space war sounds. Push
the press switch (S2) to
hear more sounds at the
same time.
This circuit uses your body
to conduct electricity, and
turn on the circuit. Wetting
your fingers improves the
connection between the
metal and your finger.
Flash & Tone
Turn the switch (S1) on and the lamp (L1) and color LED (D8)
start flashing. You hear two different tones driving the LED and
lamp. ICs can be connected to control many different devices
at the same time.
Connecting the output of the Alarm
or Music ICs to multiple devices
(such as the LED, speaker and
lamp) enables these devices
operations to be synchronized.
-40-
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Project 94
+
Fan Flash Energy
Place the fan on the motor (M1). Hold down the press switch (S2)
for a few seconds and then watch the color LED (D8) as you
release the switch. The LED flashes briefly but only after the
batteries (B1) are disconnected from the circuit.
Do you know why the LED flashes? It flashes because the motor
uses a magnetic field to spin the shaft. When the switch is released
energy creates a brief current through the LED.
If you reverse the motor direction, then the LED will light the same
way, but the fan may fly off after the LED lights.
Project 95
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Fun with the Alarm IC
Place the fan on the motor (M1) and turn on the slide
switch (S1). The lamp (L1) lights, the motor spins,
and you hear a machine gun sound (with very faint
music in background). Cover the phototransistor
(Q4) with your hand and the sound becomes a siren.
After a while the sound will stop, hold down the press
switch (S2) and the sound resumes.
Phototransistors can be used
to control many devices such
as street lights, clock radio
alarms, night lights, etc.
-41-
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
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Project 96
Music Alarm
Combo
Project 97
Build the circuit shown
and then place the
alarm IC (U2) directly
over the music IC (U1),
resting on the three 1snaps. Turn on the
slide switch (S1) and
you will hear a siren
and music together.
After a few seconds,
covering
the
phototransistor (Q4)
will stop the music (but
the siren continues).
Project 98
Water Space War
Build the circuit shown,
including the jumper
wires going between it
and the cup of water
shown. There will be
sound when you push
the press switch (S2) or
when the jumper wires
are in the water.
Pushing the press
swtich or placing the
jumper wires out and
then back in into the
water will change the
sound played.
Hit the Target
Turn the slide switch
(S1) on and you hear
the sound of a bomb
dropping and then
exploding. The color
LED (D8) lights and
then flashes as the
bomb explodes. This
is
one
sound
generated from the
space war IC (U3).
Project 99
Light/Water Space War
Use the proceeding circuit. Replace the speaker (SP2)
with the color LED (D8, “+” to top). Putting the jumper wires
in the water OR pressing the press switch (S2) will cause
the LED to be bright.
Project 100
OR/AND Space War Light
Use the proceeding circuit. Replace the color LED (D8) with the
2.5V lamp (L1). Putting the jumper wires in the water OR pressing
the press switch (S2) will cause the lamp to be dimly lit. Putting
the jumper wires in the water AND pressing the press switch at
the same time will cause the lamp to be much brighter.
-42-
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Project 101
Sing & Fling
1
In the circuit, the outputs from the alarm (U2) and music ICs are
connected together. Build the circuit shown and then place the
alarm IC (U2) directly over the music IC (U1), resting on two 1snaps and a 2-snap. Turn on the slide switch (S1) and you will hear
a siren and music together. Push the press switch (S2) and the fan
spins, while the sound may not be as loud. The fan may rise into
the air when you release the switch. If the sound stops, shine light
on the phototransistor (Q4).
!
1
WARNING: Moving parts. Do not touch the fan or motor during
operation. Do not lean over the motor. Fan may not rise until
switch is released.
Project 102
Power Pitch
In the circuit, the outputs from the alarm and music ICs are
connected together. Build the circuit shown and then place the
alarm IC (U2) directly over the music IC (U1), resting on two 1snaps and a 2-snap. Turn on the slide switch (S1) and you will hear
a siren and music together while the lamp (L1) varies in brightness.
Push the press switch (S2) and the fan spins, while the sound may
not be as loud. The fan may rise into the air when you release the
switch.
You can replace the lamp with the color LED (D8, “+” on top). The
sound will be louder than in the preceding circuit.
-43-
!
WARNING: Moving parts. Do not touch the fan or motor during
operation. Do not lean over the motor. Fan may not rise until
switch is released.
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Project 103
Morse Code
This simple circuit can be used for communication. Press the
press switch (S2) in long and short bursts to make a pattern
of light flashes representing the dots and dashes shown in
the Morse Code table below. You can use Morse Code and
this circuit to send secret messages to some friends in the
room without others knowing what you’re saying.
If you have a strong flashlight or searchlight then you can
send messages to friends far away at night. During World
War II Navy ships sometimes communicated by flashing
Morse Code messages between ships using searchlights
(because radio transmissions might reveal their presence to
the enemy).
Years ago Indians would send messages to other tribes using
smoke signals and a special code.
Morse Code: The forerunner of today’s telephone system
was the telegraph, which was widely used in the latter half
of the 19th century. It only had two states - on or off (that is,
transmitting or not transmitting), and could not send the
range of frequencies contained in human voices or music.
A code was developed to send information over long
distances using this system and a sequence of dots and
dashes (short or long transmit bursts). It was named Morse
Code after its inventor. It was also used extensively in the
early days of radio communications, though it isn’t in wide
use today. It is sometimes referred to in Hollywood movies,
especially Westerns. Modern fiber optics communications
systems send data across the country using similar coding
systems, but at much higher speeds.
A
B
C
D
E
F
G
H
I
J
K
L
M
._
_...
_._.
_..
.
.._.
__.
....
..
.___
_._
._..
__
MORSE CODE
N
_.
O
___
P
.__.
Q
__._
R
._.
S
...
T
_
U
.._
V
..._
W
.__
X
_.._
Y
_.__
Z
__..
._._._
Period
Comma _ _ . . _ _
Question . . _ _ . .
1
.____
2
..___
3
...__
4
...._
5
.....
6
_....
7
__...
8
___..
9
____.
0
_____
-44-
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Project 104 Motor Space Sounds
1
Turn it on and wait for any
sounds to stop. Then, spin
the motor (M1) and the
sounds play again.
Do you know why turning
the motor makes the sound
play?
Actually, the DC
motor is also a DC
generator and when you
turn it, the motor generates
a voltage that triggers the
sound circuits.
Project 106
A
B
This circuit is loud and may bother
other people around you so replace
the speaker (SP2) with the color
LED (D8), (“+” side on top); the
circuit operates in the same manner
but now the color LED flashes
instead of the speaker making
sounds.
Light-controlled Lamp
Build the circuit to the left. Cover the phototransistor (Q4), turn the slide switch
(S1) on, and notice that the lamp (L1) is off after several seconds. Place the
unit near a light and the lamp turns on. Cover the phototransistor again. The
lamp turns off. The resistance of the phototransistor decreases as the light
increases. The low resistance acts like a wire connecting point C to the positive
(+) side of the battery activating, the music IC (U1).
Project 107
Motor-controlled Lamp
C
2
-45-
The lamp (L1) is used here
as a 3-snap wire, and will
not light.
Project 105
Twist & Blink
Use the preceding circuit. Remove the phototransistor (Q4) and connect the
motor (M1) across points A & B. The lamp (L1) lights for a few seconds and
then turns off. Turn the slide switch (S1) on and turn the shaft of the motor and
the lamp will light. As the motor turns, it produces a voltage. This is because
there is a magnet and a coil inside the motor. When the axis turns the magnetic
field will change and generate a small current in the coil and a voltage across
its terminals. The voltage then activates the music IC (U1).
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Project 108
Multi-Speed Light Fan
Turn on the slide switch (S1). Push the press switch and cover/uncover
the photottransistor (Q4) to light the color LED (D8) and make the motor
(M1) and fan spin at different speeds. The motor also produces sound.
Project 109
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
Light Disrupter
Turn on the slide switch (S1); the lamp (L1) and color LED (D8)
are on. Notice how the color LED is changing colors.
Now push the press switch (S2) to spin the motor and glow fan.
Notice how the color LED color pattern has changed. You can try
this with or without the glow fan on the motor.
The motor produces electrical “noise” as it
spins, which can confuse the color-changing
circuit in the color LED. The lamp is just a
simple light bulb, and is not affected by the
!
WARNING: Moving parts. Do not touch the fan or
motor during operation. Do not lean over the motor.
-46-
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Project 110 Alarm Circuit
A
B
C
D
Build the circuit shown. When you turn on the slide switch
(S1), the integrated circuit (U2) should start sounding a very
loud alarm sound. This integrated circuit is designed to
sweep through all the frequencies so even hard of hearing
people can be warned by the alarm.
Project 111
Project 112
Machine
Fire Engine
Gun
Use the preceding
circuit, but add a
connection between
the points marked B
& C using a 1-snap
and a 2-snap. Now it
sounds
like
a
machine gun.
Use the preceding
circuit, but remove
the
connection
between B & C, and
add a connection
between A & B. Now
it sounds like a fire
engine
Project 114 Quieter Alarm Circuits
A
D
-47-
B
C
Project 115
Quieter Machine
Gun
Use the preceding
circuit, but add a
connection between
the points marked B
& C using a 1-snap
and a 2-snap. Now it
sounds
like
a
machine gun.
Project 113
European
Siren
Use the preceding
circuit, but remove
the
connection
between A & B, and
add a connection
between A & D. Now
it sounds like a
European siren.
Use the project 107 circuit, but add
the 100W resistor (R1) in series with
the speaker (SP2), as shown. Now
the circuit is not as loud.
Project 116
Project 117
Quieter Fire Quieter European
Siren
Engine
Use the preceding
circuit, but remove
the
connection
between B & C, and
add a connection
between A & B. Now
it sounds like a fire
engine
Use the preceding
circuit, but remove
the
connection
between A & B, and
add a connection
between A & D. Now
it sounds like a
European siren.
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Project 118
Pencil Alarm
Build the circuit shown and connect the two jumpers to it, leave the loose
ends of the jumpers unconnected for now. There is one more part you
need and you are going to draw it. Take a pencil (No. 2 lead is best but
other types will also work). SHARPEN IT, and fill in the shape below. You
will get better results if you place a hard, flat surface directly beneath this
page while you are drawing. Press hard (but don’t rip the paper), and fill
in the shape several times to be sure you have a thick, even layer of
pencil lead.
W
x
Y
Turn on the slide switch (S1) and take the loose ends of the jumpers,
press them to the shape and move them around over the drawing. If you
don’t hear any sound then move the ends closer together and move over
the drawing, add another layer of pencil lead, or put a drop of water on
the jumper ends to get better contact.
Now you can draw your own shapes and see what kinds of sounds you
can make.
Z
The black core of
pencils is graphite,
the same material
used in resistors.
Project 119
Project 120
Pencil Sound
Pencil Alarm
Variant
Remove the jumper connected
to point Y (as shown in the
drawing) and connect it to point
X instead. Touch the loose ends
to the pencil drawing again, the
sound is different now.
Next connect a 2-snap wire
between points X & Y connect
the jumper to either point.
Touch the loose ends to the
pencil drawing again, you
hear a different sound.
Project 121
Another Pencil
Alarm Variant
Now remove the 2-snap wire
between X & Y and connect it
between X & Z, connect the
jumpers to W & Y. Touch the loose
ends to the pencil drawing again,
you hear yet another sound.
Now you can draw your own
shapes and see what kinds of
sounds you can make.
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Project 122
A
B
Simple Water Alarm
Build the circuit shown but initially leave the jumper wires outside
the cup. Turn on the slide switch (S1); nothing happens. Place the
jumper wires into a cup of water and an alarm sounds!
You could use longer wires and lay them on your basement floor, if
your basement floods during a storm, then this circuit will sound an
alarm.
Project 123
Simple Salt
Water Alarm
Project 124
Ambulance
Water Alarm
Project 125
Ambulance
Contact Alarm
Add salt to the water and the tone of the alarm
is louder and faster, telling you that salt is in
the water you detected. Also, try holding the
jumper wires with your fingers to see if your
body can set off the alarm.
Modify the circuit in Project 122 by adding a 3snap wire between points A & B. The water
alarm works the same way but now it sounds
like an ambulance.
The same circuit also detects if the jumper
wires get touched together, so connect them
to each other. The tone of the sound is now
much different. Therefore, this circuit will tell
you if there is water between the jumper wires
or if the wires are touching each other.
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A
Project 126
B
C
Symphony of Sounds
Turn on the slide switch (S1); you hear
sounds from the music & alarm ICs (U1 &
U2), and the color LED (D8) lights. Push
the press switch (S2) several times to add
sounds from the space war IC (U3).
D
This circuit has a lot
happening at once.
x
Y
Project 128
Incandescent
Symphony of
Sounds
Use the preceding
circuit, but replace
the color LED (D8)
with the lamp (L1).
Project 129
Siren Symphony
of Sounds
Use projects 126128, but remove the
2-snap wire that is on
top of U2.
Project 130
Machine Gun
Symphony of
Sounds
Use projects 126128, but move the 2snap wire of top of U2
one space to the right
(so it is across points
B & C).
Project 127
Photo Symphony
of Sounds
Use the preceding
circuit, but add the
phototransistor (Q4)
across points X & Y
using a 1-snap wire;
the “+” side of Q4
should be towards
U3.
Project 131
Euro Siren
Symphony of
Sounds
Use projects 126128, but move the 2snap wire of top of U2
to be across points A
& D.
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A
Project 132
B
C
2-Light Symphony of Sounds
This circuit is similar to to project 126 (Symphony of Sounds), but
adds the lamp (L1). Note that the lamp does not snap on the battery
holder (B1), but is secured by the 2-snap wire on level 3.
Turn on the slide switch (S1); you hear sounds from the music &
alarm ICs (U1 & U2), and the color LED (D8) and lamp light. Push
the press switch (S2) several times to add sounds from the space
war IC (U3).
D
You can also use the variants in projects 127-131 here.
A
Project 133
Super Symphony of
Sounds
D
B
C
+
This circuit is similar to to the preceding circuit, but also adds
the motor (M1) and glow fan. Note that the speaker (SP2)
does not snap on the battery holder (B1), but is secured by
the 2-snap wire on level 3.
Turn on the slide switch (S1); you hear sounds from the music
& alarm ICs (U1 & U2), the color LED (D8) & lamp (L1) light,
and the motor spins the glow fan. Push the press switch (S2)
several times to add sounds from the space war IC (U3).
You can also use the variants in projects 127-131 here.
-51-
!
WARNING: Moving parts. Do not touch the fan or motor during operation.
Do not lean over the motor. Fan may not rise until switch is released.
SC-130_050115.qxp 5/14/15 11:47 AM Page 53
Page 31 for Project 66
Page 32 for Project 68
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Notes
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SC-130_050115.qxp 5/14/15 11:47 AM Page 55
OTHER SNAP CIRCUITS® PROJECTS!
For a listing of local toy retailers who carry Snap Circuits visit www.elenco.com or call us toll-free at 800-533-2441. For Snap Circuits accessories,
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Snap Circuits Motion
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Model SC-300
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with over 185 projects
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●
●
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●
Antenna Coil
Microphone
Variable Capacitor
Five Fixed-value
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●
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with over 750 projects
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The full-color project book will make
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Build over 500 projects
Including:
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Contains Over 75 Parts
High Frequency IC Including:
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Adjustable Resistor ● Analog Meter
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Learn about energy sources and how to
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Snap Circuits Extreme
®
®
with over 300 projects
FEATURES:
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Snap Circuits Pro
Snap Circuits
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● Diode
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Flasher
●
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Contains Over 80 Parts
Including:
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Snap Circuits Light
®
Model SCL-175
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iPod® shown
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-54-
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