Elenco Electronics K-36 Assembly And Instruction Manual

SOUND ACTIVATED SWITCH KIT

MODEL K-36

Assembly and Instruction Manual

Elenco®Electronics, Inc.

ight © 2004, 1989 b

yr

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®

Electronics

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, photocopying, or otherwise without written permission from the publisher.

ved. Revised 2004 REV-I 753236

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
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 #

1 R17 4.7kΩ 5% 1/4W yellow-violet-red-gold 144700
3 R1, R5, R16 10kΩ 5% 1/4W brown-black-orange-gold 151000
1 R3 22kΩ 5% 1/4W red-red-orange-gold 152200
4 R4, R10, R12, R14 100kΩ 5% 1/4W brown-black-yellow-gold 161000
4 R2, R6, R9, R13 220kΩ 5% 1/4W red-red-yellow-gold 162200
1 R7 270kΩ 5% 1/4W red-violet-yellow-gold 162700
1 R15 330kΩ 5% 1/4W orange-orange-yellow-gold 163300
1 R11 1MΩ 5% 1/4W brown-black-green-gold 171000
1 R8 4.7MΩ 5% 1/4W yellow-violet-green-gold 174700
1 P1 100kΩ Trim Pot 191611

CAPACITORS

Qty. Symbol Value Description Part #

4 C5, C6, C8, C9 .001µF (102) Discap 231036
2 C1, C3 .01µF (103) Discap 241031
2 C2, C4 .1µF (104) Discap 251010
1C7 1µF Electrolytic (Lytic) 261047
1 C10 100µF Electrolytic (Lytic)

®

Electronics (address/phone/e-

281044

SEMICONDUCTORS

Qty. Symbol Value Description Part #

1 Q1 2N3904 Transistor 323904
1 Q2 MPS6531 Transistor 326531
1 U2 4001 Integrated Circuit 334001
1 U1 4011 Integrated Circuit 334011
1 LED LED Red 350002

MISCELLANEOUS

Qty. Symbol Description Part #

1 PC Board 518036
1 Solder 551124
1 MIC Microphone 568000
1 Battery Snap 9V 590098
2 IC Socket 14-pin 664014

PARTS IDENTIFICATION

LED

Transistor

Capacitor

s

otentiometer

P

Microphone

Resistor

Electrolytic Discap

Battery SnapIC Socket Integrated

Circuit

-1-

IDENTIFYING RESISTOR VALUES

Use the following information as a guide in properly identifying the value of resistors.

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.

Second Digit

First Digit

103K

100V

Multiplier

Tolerance*

Multiplier

For the No.01234589
Multiply By 1 10 100 1k 10k 100k .01 0.1

10µF 16V

Maximum Working Voltage

The value is 10 x 1,000 =
10,000pF or .01µF 100V

INTRODUCTION

Just clap y
(LED).

our hands together twice and watch the Sound Activ

Clap twice more and watch the LED turn off

.

THEORY OF OPERATION

Figure 1 sho
switch and two types of digital circuits, a one-shot and a flip-flop.

TRANSISTOR

ws the block diagram of the Sound Activated Switch. It consists of a transistor amplifier, a transistor

AMPLIFIER

ONE-SHOT FLIP-FLOP

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 +
The letter J indicates a tolerance of +

10%

5%

ated Switch turn on the light emitting diode

TRANSISTOR

SWITCH

THE TRANSISTOR AMPLIFIER

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

ansistor amplifier is set f

tr
waveform is amplified 50 times. Capacitor C3
couples the amplified waveform to the input of the
first digital circuit.

or a gain of 50, so the

Figure 1

-2-

SENSITIVITY

The potentiometer, P1, adjusts the sensitivity of the
Sound Activated Switch. Varying the resistance of
P1 will vary the DC voltage at the input of the first
one-shot. Rotating P1 counter-clockwise causes
the voltage at the input of the first one-shot to
increase. This means that a louder clap is required
to activ
Activated Switch less sensitive to sound. Likewise,
rotating P1 clockwise causes the voltage at the
input of the first one-shot to decrease, making the
Sound Activated Switch more sensitive to sound.

ate the first one-shot, making the Sound