Elenco Sound Activated Switch User Manual
SOUND ACTIVATED SWITCH KIT
MODEL K-36
Assembly and Instruction Manual
ELENCO
®
Copyright © 2012, 1989 by Elenco®Electronics, Inc. All rights reserved. Revised 2012 REV-L 753236
No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
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®(address/phone/e-mail 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.
RESISTORS
Qty. Symbol Value Color Code Part #
r 1 R17 4.7kΩ 5% 1/4W yellow-violet-red-gold 144700
r 3 R1, R5, R16 10kΩ 5% 1/4W brown-black-orange-gold 151000
r 1 R3 22kΩ 5% 1/4W red-red-orange-gold 152200
r 4 R4, R10, R12, R14 100kΩ 5% 1/4W brown-black-yellow-gold 161000
r 4 R2, R6, R9, R13 220kΩ 5% 1/4W red-red-yellow-gold 162200
r 1 R7 270kΩ 5% 1/4W red-violet-yellow-gold 162700
r 1 R15 330kΩ 5% 1/4W orange-orange-yellow-gold 163300
r 1 R11 1MΩ 5% 1/4W brown-black-green-gold 171000
r 1R8 4.7MΩ 5% 1/4W yellow-violet-green-gold 174700
r 1 P1 100kΩ Trim Pot 191611
CAPACITORS
Qty. Symbol Value Description Part #
r 4 C5, C6, C8, C9 .001μF (102) Discap 231036
r 2 C1, C3 .01μF (103) Discap 241031
r 2 C2, C4 .1μF (104) Discap 251010
r 1C7 1μF Electrolytic (Lytic) 261047
r 1 C10 100μF Electrolytic (Lytic) 281044
SEMICONDUCTORS
Qty. Symbol Value Description Part #
r 1 Q1 2N3904 Transistor 323904
r 1 Q2 MPS6531 Transistor 326531
r 1 U2 4001 Integrated Circuit 334001
r 1 U1 4011 Integrated Circuit 334011
r 1 LED LED Red 350002
MISCELLANEOUS
Qty. Symbol Description Part #
r 1 PC Board 518036
r 1 MIC Microphone 568000
r 1 Battery Snap 9V 590098
r 2 IC Socket 14-pin 664014
Resistor
Transistor
Potentiometer
-1-
PARTS IDENTIFICATION
LED
Capacitors
Battery SnapIC Socket Integrated
Circuit
Microphone
Electrolytic Discap
• Do not short circuit the battery terminals.
• Never throw batteries in a fire or attempt to
open its outer casing.
•
Use only 9V type alkaline battery (not
included).
• Insert battery with correct polarity.
• Do not mix alkaline, standard (carbon-zinc),
or rechargeable (nickel-cadmium) batteries.
• 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.
• Remove battery when it is used up.
• Batteries are harmful if swallowed, so keep
away from small children.
Batteries:
-2-
INTRODUCTION
Just clap your hands together twice and watch the Sound Activated Switch turn on the light emitting diode
(LED). Clap twice more and watch the LED turn off.
THEORY OF OPERATION
Figure 1 shows the block diagram of the Sound Activated Switch. It consists of a transistor amplifier, a transistor
switch and two types of digital circuits, a one-shot and a flip-flop.
TRANSISTOR
AMPLIFIER
TRANSISTOR
SWITCH
ONE-SHOT FLIP-FLOP
Figure 1
IDENTIFYING RESISTOR VALUES
Use the following information as a guide in properly identifying the value of resistors.
A waveform is created when hands are clapped
together. The MIC senses this waveform and
couples it to the base of Q1 by capacitor C1 (refer
to schematic diagram). The transistor is configured
as a common emitter amplifier since the AC signal
is bypassed to ground by capacitor C2. The
transistor amplifier is set for a gain of 50, so the
waveform is amplified 50 times. Capacitor C3
couples the amplified waveform to the input of the
first digital circuit.
THE TRANSISTOR AMPLIFIER
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
For the No. 0 1 2 3 4 5 8 9
Multiply By 1 10 100 1k 10k 100k .01 0.1
Second digit
First digit
Multiplier
Tolerance*
Note: The letter “R” may be used at times to signify a
decimal point; as in 3R3 = 3.3
The letter M indicates a tolerance of +20%
The letter K indicates a tolerance of +
10%
The letter J indicates a tolerance of +
5%
Maximum working voltage
(may or may not appear on the cap)
The value is 10 x 10 = 100pF, +10%, 50V
*
CERAMIC DISC MYLAR
First digit
Second digit
Multiplier
Tolerance*
2A222J
100V
The value is 22 x 100 =
2,200pF or .0022μF, +
5%, 100V
101K
50V
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. Also,
the negative lead of a radial electrolytic is
shorter than the positive one.
Warning:
If the capacitor is connected
with incorrect polarity, it may
heat up and either leak, or
cause the capacitor to
explode.
Polarity
marking
(+)
(–)
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