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 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. r1 r3 r1 r4 r4 r1 r1 r1 r1 r1 Symbol R17 R1, R5, R16 R3 R4, R10, R12, R14 R2, R6, R9, R13 R7 R15 R11 R8 P1 Value 4.
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. For the No.
SENSITIVITY two possible output states for a flip-flop are a logic 1 and a logic 0. 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 activate the first one-shot, making the Sound Activated Switch less sensitive to sound.
CONSTRUCTION Introduction • Turn off iron when not in use or reduce temperature setting when using a soldering station. The most important factor in assembling your K-36 Sound Activated Switch 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.
ASSEMBLE COMPONENTS TO THE PC BOARD C10 - 100μF Electrolytic Cap. (see Figure F) Figure A C1 - .01μF Discap (103) MIC - Microphone (Figure D) Jumper Wire - Use a discarded resistor lead. R3 - 22kΩ 5% 1/4W Resistor (red-red-orange-gold) R5 - 10kΩ 5% 1/4W Resistor (brown-black-orange-gold) Black Red C2 - .1μF Discap (104) Battery Snap C5 - .
OPERATING PROCEDURE Figure D shows the output waveforms most important to the operation of the Sound Activated Switch. When a waveform is created by a clap, it causes the first one-shot to trigger, causing its output to switch to a logic 0. When the first oneshot’s output switches back to a logic 1, the second one-shot triggers, causing its output to change to a logic 0. When another waveform is created due to another clap, the one-shot will trigger again causing its output to go low once more.
SCHEMATIC DIAGRAM + + + FOIL SIDE OF PC BOARD QUIZ 1. The Sound Activated Switch consists of a transistor amplifier, a transistor switch and _______ types of digital circuits. 2. A ____________ is created when hands are clapped together. 3. A one-shot is also called a _____________ multivibrator. 4. When triggered, the first one-shot will remain at a logic 0 for ______ second(s). 5. When both inputs of NOR gate U2A are at a logic 0, the output will be at a logic ______. 6.
