FUNCTION GENERATOR KIT

MODEL FG-600K

Assembly and Instruction Manual

ELENCO

®

Copyright © 2014, 1999 by ELENCO ® All rights reserved. Revised 2014 REV-F

No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.

753033

PARTS LIST

If any parts are missing or damaged, see instructor or bookstore. DO NOT contact your place of purchase as they will not be able to help you. Contact ELENCO ® (address/phone/e-mail is at the back of this manual) for additional assistance, if needed.

RESISTORS

Qty.

Symbol r 1 R2

Description

10kΩ Potentiometer r 1 R3 100kΩ Potentiometer r 1 R6 (201) Resistor chip 200Ω 5% 1/8W r 1 R1 (621) Resistor chip 620Ω 5% 1/8W r 1 R5 (392) Resistor chip 3.9kΩ 5% 1/8W r 1 R7 (822) Resistor chip 8.2kΩ 5% 1/8W r 1 R8 (103) Resistor chip 10kΩ 5% 1/8W r 1 R4 (223) Resistor chip 22kΩ 5% 1/8W r 1 R9 (104) Resistor chip 100kΩ 5% 1/8W

Qty.

Symbol r 1 C6 r 1 C1

Value

820pF r 1 C5 r 1 C4

0.01µF

0.1µF r 1 C3 1µF r 3 C2, C7, C8 10µF

100µF 16V r 1 C9 1000µF 16V

Qty.

Symbol r 1 U1

Value

XR-2206

CAPACITORS

Description

Capacitor chip

Capacitor chip

Capacitor chip

Electrolytic chip

Electrolytic chip

Electrolytic radial

Electrolytic radial

SEMICONDUCTORS

Description

Integrated circuit, surface mount

Qty.

Description r 1 PC board FG-600 r 2 Switch slide PC mount (S2, S3) r 1 Switch rotary 2p 6 pos. (S1) r 1 Battery snap 9V r 1 Battery holder 9V r 3 Knob r 1 Case, top r 1 Case, bottom r 1 Binding post black r 3 Hex nut for binding post r 3 Lockwasher binding post

Part #

511002

541009

542207

590098

590099

622009

623061

623062

625031

625031HN

625031LW

MISCELLANEOUS

Qty.

Description r 2 Binding post yellow r 4 Screw 2.8 x 8mm r 2 7mm Hex pot nut r 1 9mm Hex switch nut r 2 8mm x 14mm Flat washer r 1 9mm x 15mm Flat washer r 4 Feet, rubber r 1 Label, top r 1 Tape, double-sided 3/4” x 3/4” r 12” Wire 22ga. black solid r 1 Solder, lead-free

Part #

332206SM

Part #

625034

641102

644101

644102

645101

645103

662015

721009

740020

814120

9LF99

Part #

192531

192612

196320

196362

196434

196484

196514

196522

196614

Part #

228297

241095

250195

260127

271024

281044

291044

-1-

PARTS VERIFICATION

Before beginning the assembly process, familiarize yourself with the components and this instruction book.

Verify that all of the parts are present. This is best done by checking off the parts in the parts list.

RESISTORS CAPACITORS SEMICONDUCTOR

Chip

621

Chip

XR-2206 Integrated circuit (IC)

Potentiometer

Electrolytic chip Electrolytic

(radial)

MISCELLANEOUS

Case top

PC board

Label

Lead-free solder

Rotary switch

Case bottom

Battery snap

Binding posts

DPDT switch

Screws Nuts

Knob

2.8 x 8mm

7mm

9mm

Rubber foot

Washers

Black Yellow

Flat

8 x 14mm

Flat

9 x 15mm

Binding post nut

-2-

Binding post lockwasher

Double-sided tape

Battery holder

Black wire 22ga.

INTRODUCTION

Assembly of your FG-600 Function Generator will prove to be an exciting project and give much satisfication and personal achievement. The FG-600 contains a complete function generator capable of producing sine, square and triangle wave forms. The frequency of this generator can be contiuously varied from 1Hz to 1MHz in 6 steps. A fine frequency control makes selection of any frequency in between easy. The amplitude of the wave forms are adjustable from 0 to 3Vpp. This complete function generator system is suitable for experimentation and applications by the student. The entire function generator is comprised of a single XR-2206 monolithic IC and a limited number of passive circuit components.

The FG-600 uses surface mounted components. By building this kit, you will obtain an interesting electronic device and also gain valuable experience in surface mount technology.

SPECIFICATIONS

OUTPUT:

● Waveforms: Sine, Triangle, Square

● Impedance: 600Ω + 10%.

● Frequency: 1Hz - 1MHz in 6 decade steps with variable ranges.

SINE WAVE:

● Amplitude: 0 - 3Vpp.

● Distortion: Less than 1% (at 1kHz).

● Flatness: +0.05dB 1Hz - 100kHz.

SQUARE WAVE:

● Amplitude: 8V (no load).

● Rise Time: Less than 50ns (at 1kHz).

● Fall Time: Less than 30ns (at 1kHz).

● Symmetry: Less than 5% (at 1kHz).

TRIANGLE WAVE:

● Amplitude: 0 - 3Vpp.

● Linearity: Less than 1% (up to 100kHz).

POWER REQUIREMENTS:

● Standard 9V Battery

OPERATING TEMPERATURE:

● 0

O C TO 50 O C.

PARTS VERIFICATION

Before beginning the assembly process, familiarize yourself with the components and this instruction book.

Verify that all parts are present. This is best done by checking off each item against the parts list.

Care must be taken when handling the chip resistors and capacitors.

They are very small and are easily lost. Chip resistors are marked with their component value. The first 2 digits are the first 2 digits of the resistance in ohms. The last digit gives the number of zeros following the first 2 digits. The resistor shown at right is therefore

3900Ω.

The values of the chip capacitors are not marked on the component.

The chip capacitor C6 (820pF) is in the bag with the chip resistors, the chip capacitor C5 (0.01µF) is in the bag with the lytic capacitors and the chip capacitor C4 (0.1µF) is in the bag with the IC. To avoid mixing these parts up, they should not be taken out of their packages until just before they are soldered to the PC board.

-3-

CONSTRUCTION

Introduction

The most important factor in assembling your FG-600 Function

Generator Kit is good soldering techniques. Using the proper soldering iron is of prime importance. A small pencil type soldering iron of 25 watts is recommended. The tip of the iron must be kept clean at all times and well-tinned.

Solder

For many years leaded solder was the most common type of solder used by the electronics industry, but it is now being replaced by leadfree solder for health reasons. This kit contains lead-free solder, which contains 99.3% tin, 0.7% copper, and has a rosin-flux core.

Lead-free solder is different from lead solder: It has a higher melting point than lead solder, so you need higher temperature for the solder to flow properly. Recommended tip temperature is approximately 700 O F; higher temperatures improve solder flow but accelerate tip decay. An increase in soldering time may be required to achieve good results.

Soldering iron tips wear out faster since lead-free solders are more corrosive and the higher soldering temperatures accelerate corrosion, so proper tip care is important. The solder joint finish will look slightly duller with lead-free solders.

Use these procedures to increase the life of your soldering iron tip when using lead-free solder:

• Keep the iron tinned at all times.

• Use the correct tip size for best heat transfer. The conical tip is the most commonly used.

What Good Soldering Looks Like

A good solder connection should be bright, shiny, smooth, and uniformly flowed over all surfaces.

1. Solder all components from the copper foil side only. Push the soldering iron tip against both the lead and the circuit board foil.

Soldering Iron

Component Lead

Foil

• Turn off iron when not in use or reduce temperature setting when using a soldering station.

• Tips should be cleaned frequently to remove oxidation before it becomes impossible to remove. Use Dry Tip Cleaner (Elenco ® #SH-1025) or Tip

Cleaner (Elenco ® #TTC1). If you use a sponge to clean your tip, then use distilled water (tap water has impurities that accelerate corrosion).

Safety Procedures

• Always wear safety glasses or safety goggles to protect your eyes when working with tools or soldering iron, and during all phases of testing.

• Be sure there is adequate ventilation when soldering.

• Locate soldering iron in an area where you do not have to go around it or reach over it. Keep it in a safe area away from the reach of children.

• Do not hold solder in your mouth. Solder is a toxic substance.

Wash hands thoroughly after handling solder.

Assemble Components

In all of the following assembly steps, the components must be installed on the top side of the PC board unless otherwise indicated. The top legend shows where each component goes. The leads pass through the corresponding holes in the board and are soldered on the foil side.

Use only rosin core solder.

DO NOT USE ACID CORE SOLDER!

Types of Poor Soldering Connections

1. Insufficient heat - the solder will not flow onto the lead as shown.

Rosin

2. Apply a small amount of solder to the iron tip. This allows the heat to leave the iron and onto the foil.

Immediately apply solder to the opposite side of the connection, away from the iron. Allow the heated component and the circuit foil to melt the solder.

Solder

Foil

Circuit Board

Soldering Iron

Soldering iron positioned incorrectly.

2. Insufficient solder - let the solder flow over the connection until it is covered.

Use just enough solder to cover the connection.

Solder

Component Lead

Gap

Solder

Soldering Iron

3. Excessive solder - could make connections that you did not intend to between adjacent foil areas or terminals.

3. Allow the solder to flow around the connection. Then, remove the solder and the iron and let the connection cool. The solder should have flowed smoothly and not lump around the wire lead.

Solder

Foil

Soldering Iron

4. Here is what a good solder connection looks like.

4. Solder bridges - occur when solder runs between circuit paths and creates a short circuit. This is usually caused by using too much solder.

To correct this, simply drag your soldering iron across the solder bridge as shown.

Foil Drag

-4-

Assemble Surface Mount Components

The most important factor in assembling your FG-600 Function Generator Kit is good soldering techniques.

Using the proper soldering iron is of prime importance. A small pencil type iron of 10-15 watts is recommended.

A sharply pointed tip is essential when soldering surface mount components. The tip of the iron should be kept clean and well tinned at all times. Many areas on the printed circuit board are close together and care must be given not to form solder shorts. Solder shorts may occur if you accidentally touch an adjacent foil, particularly a previously soldered connection, using too much solder, or dragging the iron across adjacent foils. If a solder short occurs, remove it with your hot iron. Use only rosin core solder. Before soldering the FG-600 board should be taped to the workbench to keep it from moving when touched with the soldering iron. For a good soldering job, the areas being soldered must be heated sufficiently so that the solder flows freely. When soldering surface mount resistors and capacitors, the following procedure may be used:

1. Using tweezers, place the surface mount component on the PC board pads and secure in place with tape.

2. Apply a small amount of solder to the soldering iron tip. This allows the heat to leave the iron and flow onto the foil.

Tape

Iron

3. Place the iron in contact with the PC board foil. Apply a small amount of solder simultaneously to the foil and the component and allow them to melt the solder.

Solder

4. Remove the iron and allow the solder to cool. The solder should have flowed freely and not lump up around the component.

5. Remove the tape and solder the other side of the component.

When soldering the transistors, diodes and integrated circuits, the following procedure may be used:

1. Place the component on the PC board pads and secure in place with tape.

2. Apply a small amount of solder to the soldering iron tip.

3. Place the soldering iron tip on top of the component lead to be soldered and apply solder simultaneously to the lead and the PC board foil.

Tweezers 4. Remove the iron and allow the solder to cool. The solder should have flowed freely and not lump up around the component.

After a component is completely soldered, each solder joint should be inspected with a magnifying glass. If the solder has not flowed smoothly, a bad solder joint is indicated. This occurs when the component and pad have not been heated sufficiently. To correct, reheat the connection and if necessary add a small amount of additional solder.

Another way to solder surface mount components is as follows:

Iron

1. Apply a small amount of solder to the soldering iron tip.

2. Using tweezers, hold the component on the PC board pads.

3. Apply the soldering iron simultaneously to the component and pad and allow the solder to flow around the component.

4. Remove the soldering iron and allow the connection to cool.

Solder

-5-

ASSEMBLE COMPONENTS TO THE PC BOARD

Care must be given to identifying the proper components and in good soldering habits. Refer to the soldering tips section in this manual before you begin installing the components. Place a check mark in the box after each step is complete.

R1 - 620Ω 5% 1/8W Res. Chip

(621)

C7 - 10µF Electrolytic Chip

(see Figure A)

U1 - XR-2206P IC Surface Mnt.

(see Figure B)

R9 - 100kΩ 5% 1/8W Res. Chip

(104)

R8 - 10kΩ 5% 1/8W Res. Chip

(103)

R5 - 3.9kΩ 5% 1/8W Res. Chip

(392)

R6 - 200Ω 5% 1/8W Res. Chip

(201)

R4 - 22kΩ 5% 1/8W Res. Chip

(223)

C5 - .01µF Capacitor Chip

(in the bag with lytic capacitors.)

C4 - .1µF Capacitor Chip

(in the bag with IC.)

C3 - 1µF Electrolytic Chip

(see Figure A)

C6 - 820pF Capacitor Chip

(in the bag with resistors.)

C2 - 10µF Electrolytic Chip

(see Figure A)

C8 - 10µF Electrolytic Chip

(see Figure A)

R7 - 8.2kΩ 5% 1/8W Res. Chip

(822)

Figure A

This capacitor is polarized, be sure that the (+) and (–) sides are positioned correctly.

Warning: If the capacitor is connected with incorrect polarity, it may heat up and either leak or cause the capacitor to explode.

Figure B

Mount IC with pin 1 as shown on the PC board illustration.

-6-

ASSEMBLE COMPONENTS TO THE PC BOARD

S1 - 6 position Rotary Switch

(see Figure C)

C1 - 100µF 16V Electrolytic

(see Figure D)

C9 - 1000µF 16V Electrolytic

(see Figure D)

BT - Battery Snap

(see Figure F)

S3 - Slide Switch

R3 - 100kΩ Pot PC Mount

R2 - 10kΩ Pot PC Mount

(see Figure E)

Jumper Wire

Jumper Wire

(see Figure G)

J1 - 3” Black Wire

J2 - 3” Black Wire

J3 - 3” Black Wire

(see Figure H)

S2 - Slide Switch

Figure C

Cut off tab

Figure E

Mount the pot down flush with the PC board. Solder and cut off excess leads.

Mount down flush with PC board. Cut off tab

Figure D

Electrolytic capacitors have polarity. Be sure to mount them with the negative (–) lead

(marked on side) in the correct hole. Bend the electrolytic capacitors as shown.

Warning: If the capacitor is connected with incorrect polarity, it may heat up and either leak or cause the capacitor to explode.

Polarity marking

Figure F

Thread the battery snap wires through the hole in the PC board from the solder side as shown.

Solder the red wire to the BT+ point and the black wire to the BT– point on the PC board.

Red wire (BT+)

Black wire (BT–)

Figure G

Form a discarded piece of an electrolytic lead into a jumper wire by bending the wire into the correct length and mounting it to the PC board.

Red wire (BT+)

Black wire (BT–)

Figure H

Cut three 3” wires and strip 1/4” of insulation off of both ends of the wires. Solder these wires to the points J1, J2 and J3.

(–) (+)

-7-

INSTALL COMPONENTS TO FRONT PANEL (continued)

r Install the colored binding posts to the panel as shown in Figure I. Use the hardware shown in the figure. Make sure that the small nuts are tight.

Nuts

Lockwashers

Figure I

WIRING (See Figure J)

r Solder the wire from hole J1 on the PC board to the first yellow binding post as shown.

r Solder the wire from hole J2 on the PC board to the second yellow binding post as shown.

r Solder the wire from hole J3 on the PC board to the black binding post as shown.

Figure J

Wire from

Point J2

Wire from

Point J1

Binding post

Black

Small nut

Yellow

Yellow

Component side of PC board

Wire from

Point J3

-8-

FINAL ASSEMBLY

r Fit the PC board assembly into the top case, making sure that all switches and pots come through the holes in the panel as shown in Figure K.

r Place the washers onto their locations as shown in Figure K, being careful to check the sizes. Then, tighten the hex nuts onto the potentiometers and rotary switch, noting their size as shown in Figure K.

r Peel off the protective backing on one side of the double-sided tape and adhere it to the bottom case in the location shown in

Figure L.

r Peel off the remaining protective backing from the tape and adhere the battery holder to the tape, with the battery holder in the direction shown in Figure L.

r Obtain a 9 volt battery (alkaline preferred).

Press the battery snap onto the battery terminals (see Figure L) and then mount the 9V battery onto the holder.

Top case

7mm Hex pot nuts

8mm x 14mm

Washers

Figure K

Figure L

9V Battery

Bottom case

9mm Hex switch nut

9mm x

15mm Flat washer

Battery snap

Battery holder

Double-sided tape

Top case

-9-

FINAL ASSEMBLY (continued)

r Remove the backing from each rubber foot and place them in the locations shown in Figure M.

r Assemble the top and bottom case sections and fasten with four 2.8 x 8mm self-tapping screws as shown in Figure M. Make sure the slots on the side line up with one another.

r Turn the shafts on the two potentiometers and rotary switch fully counter-clockwise. Push the three knobs onto the shafts so that the line on the knobs are on the points shown in Figure N.

2.8 x 8mm

Screws

Slot

Rubber feet

2.8 x 8mm Screws

Rubber feet

Figure N

Figure M

-10-

TESTING THE FG-600 FUNCTION GENERATOR

The unit may be tested by following the 4 steps listed below. Should any of these tests fail, refer to the

Troubleshooting Guide below.

1) SET THE SWITCHES AND POTS AS

FOLLOWS:

On/Off

Range

Frequency

Amplitude

Sine/Triangle

On

10

Maximum (clockwise)

Maximum (clockwise)

Set Sine/Triangle switch to

Sine position

In each of the following steps, start with the switch and pots as shown above.

2) OUTPUT WAVEFORMS

Connect an oscilloscope probe to the square wave output.

You should see about 8V peak to peak square wave of a little over 15Hz. Connect the oscilloscope probe to the sine/triangle wave output. You should see a sine wave of approximately 3V peak to peak or greater. Set the

Sine/Triangle switch to the Triangle wave position. You should see a triangle waveform of approximately 3V peak to peak or greater. In both sine and triangle waves, the frequency is also a little over 15Hz.

3) FREQUENCY CONTROLS

6 range settings, vary the FREQUENCY pot from max to min and check that the frequency varies according to Table 1 on page 13.

4) AMPLITUDE CONTROLS

Set the switch and pots as in Step 1. Connect the oscilloscope to the sine/triangle wave output and vary the AMPLITUDE pot. The sine wave amplitude should vary from near zero to approximately 3V peak to peak or greater.

TROUBLESHOOTING GUIDE

A) NO SINE/TRIANGLE OR SQUARE WAVE OUTPUT

1) Check the soldering on switch S3.

2) Check the soldering on IC U1.

3) Check for +9V on IC1 pin 4.

4) Check that U1 is not installed backwards.

5) Check all of the values and soldering on R1, R2, R3, R4, R5, R7, R8, R9, C8, and C9.

B) WRONG FREQUENCY ON ANY RANGE SETTING

1) This indicates a wrong value capacitor in the bad range position.

C) SINE/TRIANGLE SWITCH DOESN’T WORK

1) Check the soldering on switch S2 and R6.

2) Check the value of R6.

D) AMPLITUDE CONTROL DOESN’T WORK

1) Check the soldering on R3, R7, R8, R4 and R9.

2) Check the values of the above mentioned components.

E) FREQUENCY CONTROL DOESN’T WORK

1) Check the soldering on R1 and R2.

2) Check the values of the above two resistors.

-11-

FUNCTIONAL DESCRIPTION

The FG-600 is a function generator integrated circuit capable of producing high quality sine, triangle, and square waves of high stability and accuracy. A picture of each waveform is shown below:

Sine Wave Triangle Wave Square Wave

THEORY OF OPERATION

The heart of the FG-600 Function Generator is the

XR-2206 monolithic function generator integrated circuit. The XR-2206 is comprised of four main functional blocks as shown in the functional block diagram (Figure 1). They are:

● A Voltage Controlled Oscillator (VCO)

● An Analog Multiplier and Sine-shaper

● Unity Gain Buffer Amplifier

● A set of current switches

The VCO actually produces an output frequency proportional to an input current, which is produced by a resistor from the timing terminals to ground. The current switches route one of the currents to the VCO to produce an output frequency. Which timing pin current is used, is controlled by the FSK input (pin 9).

In the FG-600, the FSK input is left open, thus only the resistor on pin 7 is used. The frequency is determined by this formula:

Timing

Resistor f o

= 1/RC Hz where f o is the frequency in Hertz

R is the resistance at pin 7 in Ohms

C is the capacitance across pin 5 and 6 in Farads

FUNCTIONAL BLOCK DIAGRAM

AM Input

Sine/Saw

Output

Mult. Out

1

2

V+

3

4

Timing

Capacitor

5

6

7

8

+1

VCO

Current

Switches

Multiplier and

Sine

Shaper

Figure 1

16

15

Symmetry

Adjust

14

13

Waveform

Adjust

12

11

Ground

Sync

Output

10

9

Bypass

FKS

Input

Note that frequency is inversely proportional to the value of RC. That is, the higher the value of RC, the smaller the frequency.

The resistance between pins 13 and 14 determine the shape of the output wave on pin 2. No resistor produces a triangle wave. A 200Ω resistor produces a sine wave.

-12-

CONTROLS

RANGE SWITCHES

Six ranges of frequency are provided by the range switch as shown in Table 1.

POSITION

1

2

3

4

5

6

SINE/TRIANGLE SWITCH

This SINE/TRIANGLE Switch selects the waveform, sine wave or triangle wave, sent to the

SINE/TRIANGLE output terminal.

FREQUENCY MULTIPLIER

The multiplier is a variable control allowing frequency settings between fixed ranges. The ranges are as shown in Table 1.

AMPLITUDE CONTROL

The Amplitude Control provides amplitude adjustment from near 0 to 3V or greater for both sine and triangle waveforms.

TYPICAL FREQUENCY RANGE

1Hz - 15Hz

10Hz - 150Hz

100Hz - 1.5kHz

1kHz - 15kHz

10kHz - 150kHz

100kHz - 1MHz

Table 1

ON/OFF SWITCH

The ON/OFF Switch turns the power to the FG-600 on or off.

OUTPUT TERMINAL

The output marked SINE/TRIANGLE provides the sine and triangle waveforms. The output marked

SQUARE WAVE provides the square wave. The output marked GND provides the ground for all output waveforms.

QUIZ (answers on bottom of following page)

1) The heart of the FG-600 Function Generator is the _________ monolithic function generator integrated circuit.

2) The XR-2206 is comprised of four main blocks.

They are ____________________________,

___________________, __________________, and ____________________.

3) The VCO actually produces an output frequency proportional to an input ________________.

4) The current switches route one of the currents to the VCO to produce an output __________.

5) The frequency is determined by the formula

_______________.

6) Frequency is inversely proportional to the value of _____________.

7) The resistance between pins 13 and 14 determine the shape of the __________ wave on pin 2.

8) No resistor produces a __________ wave.

9) A 200Ω resistor produces a ___________ wave.

10) The six ranges of frequency provided by the range switch are:

________ to ________.

________ to ________.

________ to ________.

________ to ________.

________ to ________.

________ to ________.

-13-

EDUCATION KITS

Complete with PC Board and Instruction Book

Space War Gun

K-10

Rapid fire or single shot with 2 flashing LEDs.

0-15V Power Supply

K-11

A low-cost way to supply voltage to electronic games, etc.

Christmas Tree

K-14

Produces flashing colored LEDs and three popular

Christmas melodies.

LED Robot Blinker

K-17

You’ll have fun displaying the

PC board robot.

Learn about free-running oscillators.

Requires 9V battery

0-15VDC @ 300mA

Requires

9V battery

Digital Bird

K-19

You probably have never heard a bird sing this way before.

Nerve Tester

K-20

Test your ability to remain calm.

Indicates failure by a lit LED or mild shock.

Yap Box

K-22A

This kit is a hit at parties.

Makes 6 exciting sounds.

Requires

9V battery

Burglar Alarm

K-23

Alarm for your car, house, room, or closet.

Requires

9V battery

Whooper Alarm

K-24

Can be used as a sounder or siren.

Requires

9V battery

Requires

9V battery

Metal Detector

K-26

Find new money and old treasure. Get started in this fascinating hobby.

Requires

9V battery

Pocket Dice

K-28

To be used with any game of chance.

FM Microphone

AK-710/K-30

Learn about microphones, audio amplifiers, and RF oscillators. Range up to 100 feet.

Requires 2

“AA” batteries

Telephone Bug

K-35

Our bug is only the size of a quarter, yet transmits both sides of a t e l e p h o n e conversation to any FM radio.

Requires 9V battery

Requires

9V battery

Sound Activated Switch

K-36

Clap and the light comes on . . .

clap again and it goes off.

Requires

9V battery

Lie Detector

K-44

The sound will tell if you are lying. The more you lie, the louder the sound gets.

Training course incl.

Motion Detector

AK-510

Use as a sentry, message minder, burglar alarm, or a room detector.

No batteries required!

Two IC AM Radio

AM-780K

New design - easy-to-build, complete radio on a single PC board. Requires 9V battery.

Requires 9V battery

Requires

9V battery

Requires

9V battery

Transistor Tester

DT-100K

Test in-circuit transistors and diodes.

0-15VDC Variable Voltage

DC Power Supply Kit

XP-15K

Ideal for students, technicians, and hobbyists. Great for breadboarding.

Auto-scan FM Radio Kit

FM-88K

Unique design - two-IC FM receiver with training course.

Requires

9V battery

Requires

9V battery

-14-

SCHEMATIC DIAGRAM

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; 9 ain gle y G an nit

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) tri

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8 er,

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Sh

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) o ne

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Si z, 1

RC nd

0kH

6) r a

15

C; plie z -

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0kH

) 1 5 g Mu z, 1 ncy; alo ue

An

5kH - 1 req r, An

) F to kHz 1

4 nt; scilla kHz, urre d O

.5

) C lle

1 to tro s; 3 on

Hz 00 che e C

1 ag

Swit

Hz, olt

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2)

1 f C

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20

0H

Se

XR-2 z, 1 5H

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1) to r a

Hz ie

ELENCO

®

150 Carpenter Avenue l Wheeling, IL 60090

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