Elenco | K38 | Owner Manual | Elenco K38 Capacitor Substitution Box Owner Manual

Elenco K38 Capacitor Substitution Box Owner Manual
CAPACITANCE SUBSTITUTION BOX
MODEL K-38
Assembly and Instruction Manual
Elenco Electronics, Inc.
®
Copyright © 2008, 1989 by Elenco® Electronics, Inc. All rights reserved.
Revised 2008
REV-J
No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
753130
The Capacitance Substitution Box is a convenient instrument in determining the desired capacitance values in
circuits under design or test. The values selected for your capacitance substitution box were determined to be
the most commonly used in modern solid-state circuits. The values are from 100pF to .1μF in 24 steps.
PARTS LIST
If you are a student, and any parts are missing or damaged, please see instructor or bookstore.
If you purchased this kit from a distributor, catalog, etc., please contact Elenco® Electronics (address/phone/email is at the back of this manual) for additional assistance, if needed. DO NOT contact your place of purchase
as they will not be able to help you.
CAPACITORS
Qty.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Symbol
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
Description
100pF (101) 50V
150pF (151) 50V
220pF (221) 50V
330pF (331) 50V
470pF (471) 50V
560pF (561) 50V
680pF (681) 50V
820pF (821) 50V
1000pF (102) 50V
1500pF (152) 50V
2200pF (222) 50V
3300pF (332) 50V
.0047μF (472) 50V
.0056μF (562) 100V
.0068μF (682) 50V
.0082μF (822) 100V
.01μF (103) 100V
.015μF (153) 100V
.022μF (223) 100V
.033μF (333) 100V
.047μF (473) 100V
.056μF (563) 100V
.068μF (683) 100V
.1μF (104) 100V
Qty.
1
1
2
2
1
2
2
1
1
12”
12”
Description
PC Board
PC Mount Switch
12 Position Switch
Knob
Case w/ Cover and Screws
Nut 9mm
Washer 9mm x 15mm
Alligator Clip Black
Alligator Clip Red
Wire Black Stranded
Wire Red Stranded
Part #
221017
221510
222210
223317
224717
225610
226880
228210
231035
231516
232216
233310
234710
235618
236810
238218
241017
241517
242217
243317
244717
245618
246818
251017
MISCELLANEOUS
Part #
517007
541103
542013
622009
62CS440
644102
645103
680001
680002
814210
814215
-1-
PARTS IDENTIFICATION
Switch PC Mount
9mm Nut
Switch 12 Position
Washer
Alligator Clip
Capacitor
PC Board
IDENTIFYING CAPACITOR VALUES
Capacitors will be identified by their capacitance value in pF (picofarads), nF (nanofarads), or μF (microfarads). Most
capacitors will have their actual value printed on them. Some capacitors may have their value printed in the following
manner. The maximum operating voltage may also be printed on the capacitor.
Multiplier
Warning:
If the capacitor is
connected
with
incorrect polarity, it
may heat up and
either
leak,
or
cause the capacitor
to explode.
0
1
2
3
Multiply By
1
10
100
1k
8
10k 100k .01
The letter K indicates a
tolerance of +10%
Maximum
Working Voltage
The letter J indicates a
tolerance of +5%
METRIC UNITS AND CONVERSIONS
Means
Pico
nano
micro
milli
unit
kilo
mega
Multiply Unit By
.000000000001
.000000001
.000001
.001
1
1,000
1,000,000
Or
10-12
10-9
10-6
10-3
100
103
106
1. 1,000 pico units = 1 nano unit
2. 1,000 nano units = 1 micro unit
3. 1,000 micro units= 1 milli unit
4. 1,000 milli units = 1 unit
5. 1,000 units
= 1 kilo unit
6. 1,000 kilo units = 1 mega unit
-2-
0.1
Tolerance
The value is 10 x 1,000 = 10,000pF or .01μF 100V
Abbreviation
p
n
μ
m
–
k
M
9
The letter M indicates a
tolerance of +20%
100V
Polarity
Marking
5
Multiplier
Second Digit
103K
4
Note: The letter “R” may
be used at times to
signify a decimal point;
as in 3R3 = 3.3
First Digit
10μF 16V
Electrolytic capacitors have a positive
and a negative electrode. The negative
lead is indicated on the packaging by a
stripe with minus signs and possibly
arrowheads.
For the No.
CONSTRUCTION
Introduction
The most important factor in assembling your K-38 Capacitance Substitution Box Kit is good soldering
techniques. Using the proper soldering iron is of prime importance. A small pencil type soldering iron of 25 40 watts is recommended. The tip of the iron must be kept clean at all times and well tinned.
Safety Procedures
•
•
•
•
Wear eye protection when soldering and during all phases of construction.
Locate soldering iron in an area where you do not have to go around it or reach over it.
Do not hold solder in your mouth. Wash your hands thoroughly after handling solder.
Be sure that there is adequate ventilation present.
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!
What Good Soldering Looks Like
Types of Poor Soldering Connections
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.
1. Insufficient heat - the
solder will not flow onto the
lead as shown.
Soldering Iron
Component Lead
Foil
Soldering iron positioned
incorrectly.
Circuit Board
2.
3.
4.
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.
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.
Rosin
2. Insufficient solder - let the
solder flow over the
connection until it is
covered. Use just enough
solder
to
cover
the
connection.
Soldering Iron
Solder
Foil
Solder
Gap
Component Lead
Solder
3. Excessive solder - could
make connections that you
did not intend to between
adjacent foil areas or
terminals.
Soldering Iron
Solder
Foil
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.
Here is what a good solder
connection looks like.
-3-
Soldering Iron
Foil
Drag
ASSEMBLY INSTRUCTIONS
Begin the PC board assembly with the 100pF capacitor placed in position R1. Be sure to
identify the correct value. Bend the leads to fit. Place the capacitor into the PC board with
the leads coming out on the copper foil side. Solder into place and clip off the excess
leads.
R9 - 1000pF (102) 50V Cap.
R22 - .056μF (563) 100V Cap.
R7 - 680pF (681) 50V Cap.
R24 - .1μF (104) 100V Cap.
R8 - 820pF (821) 50V Cap.
R23 - .068μF (683) 100V Cap.
R10 - 1500pF (152) 50V Cap.
R21 - .047μF (473) 100V Cap.
R11 - 2200pF (222) 50V Cap.
R20 - .033μF (333) 100V Cap.
R12 - 3300pF (332) 50V Cap.
R19 - .022μF (223) 100V Cap.
R1 - 100pF (101) 50V Cap.
R18 - .015μF (153) 100V Cap.
R2 - 150pF (151) 50V Cap.
R17 - .01μF (103) 100V Cap.
R3 - 220pF (221) 50V Cap.
R16 - .0082μF (822) 100V Cap.
R5 - 470pF (471) 50V Cap.
R14 - .0056μF (562) 50V Cap.
R6 - 560pF (561) 50V Cap.
R13 - .0047μF (472) 100V Cap.
R4 - 330pF (331) 50V Cap.
R15 - .0068μF (682) 50V Cap.
-4-
SW3 - PC Mount Switch
SW1
Mount SW3 in the place shown on the PC board.
Solder into place.
SW2
Bend the tab on the switches
down (see Figure 2). Attach the
two switches loosely to the front
panel with the 9mm nuts and
washers. Line up the holes of
the PC board with the switch
lugs, as shown in Figure 3. Be
sure that the board lays flat,
then solder the lugs into place.
Tighten down the 9mm nuts.
Red Test Lead
Black Test Lead
Cut off 1 1/2” of wire off of both the red and black
wires (SAVE them for later use). Strip 1/4” of
insulation off both ends of the 10 1/2” red and black
wires and insert them into the holes as marked on
the PC board. Solder into place. Tie a knot with
both wires 1 1/2” from the surface of the PC board
as shown in Figure 1. Pull the wires through the
hole in the cover. Slide the alligator boots onto the
wires. Solder the wires to the alligator clips. Then,
slide the boots onto the clips.
Bend Tab Over
Figure 2
PC Board
Washer
9mm Nut
Cover
Figure 3
Jumper wire from SW1
Jumper wire from SW2
Strip 1/4” of insulation off of both ends of the 1 1/2”
red and black wires. Solder one end of the wire to the
wiper pin on the 12 position switches and the other to
the pad without a hole, as shown in Figure 4.
Installation of Knobs if Capacitance Meter is
Available
Place the knobs loosely on the switch posts. Push
the slide switch to the PFD position. Connect a
capacitance meter to the output. Line up the pointer
of the knob with the value shown on your meter, then
push the knob onto the shaft. Push the slide switch
to the MFD position and repeat the same procedure.
Bend Tabs
Over Wire
Figure 1
Jumper Wires
Wiper Pin
Wiper Pin
SW2
SW1
Figure 4
-5-
Installation of Knobs without Capacitance Meter
PC Board
If a capacitance meter is not available, turn both
switches so that the wiper contact is in the position
shown in Figure 5. Start with switch SW1, follow the
copper run on the PC board from the lug in contact
with the wiper to the 680pF (R7) capacitor, to be
sure that the switch is set in the proper position.
Align the knob on the SW1 (PFD) switch to the
680pF position, push the knob onto the shaft.
Follow the same procedure for switch SW2 (MFD),
except follow the copper run to the .0047μF (R13)
capacitor. Align the knob on the SW2 (MFD) switch
to the .0047μF position.
Lug
Wiper Contact
Figure 5
TESTING THE CIRCUIT
SW1 PFD POSITION
Value Position
100pF
150pF
220pF
330pF
470pF
560pF
680pF
820pF
1000pF
1500pF
2200pF
3300pF
SW2 MFD POSITION
Meter Reading
Value Position
.0047μF
.0056μF
.0068μF
.0082μF
.01μF
.015μF
.022μF
.033μF
.047μF
.056μF
.068μF
.1μF
Meter Reading
Note: Capacitors being tested have a 10% tolerance. Because of lead capacitance from the alligator clips to
the PC board, all values will read 30pF +10pF above the actual capacitance value.
SCHEMATIC DIAGRAM
-6-
Elenco® Electronics, Inc.
150 Carpenter Avenue
Wheeling, IL 60090
(847) 541-3800
Website: www.elenco.com
e-mail: elenco@elenco.com
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