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TECHNOLOGICAL UNIVERSITY (TOUNGOO)DEPARTMENT OF ELECTRONIC ENGINEERING

CLAP-OPERA TED SWITCH

STUDENTS' PROJECTSUPERVISOR

DAWYE YEAYEASSISTANT LECTURER

July 13, 2007

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TITLE

INTRODUCTIONCIRCUIT OPERATIONCLAP OPERATED CIRCUITCOMPONENTS LIST

CONTENTS

PAGE

11

34

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Introduction

The clap-operated circuit is a circuit which operates by clapping from a rem otepoint. W hen a person claps one, the first output of the circuit is turned on. If anotherone is clapped, the second output is sw itched on and then another one w ill cause toenergize the third output. For exam ple, fan , fluorescent light, T V and other appliancescan be sw itched on (or) off by clapping. This circuit can be used by changingind iv idual s itu a tion s.

Circuit Operation

Clapping sound is sensed by condenser m ic and is converted as a electronicsignal. The signal obtained from condenser m ic is amplified by transistor T1 and thenis sent to the pin 2 of 555 tim er via a capacitor C 2 .

In this circuit, 555 IC is com posed of as a m onostable (one shot) m ultiv ibrator.W hen the electronic signal getting at pin 2 is low , the output pin 3 of the 555 wellreach high. To calculate the tim e during high period, the follow ing formula can beused.

T 1 .1 RT CT1.1 x 220 k x 4.7 uf

:::: 1 .14 s

Therefore the output situation does not change during the 1.14s althoughanother clapping is done.

4017 is a decade counter Ie. The pin 14 of IC is a input and this IC has 10output pins (3,2 ,4,7,10,1 ,5 ,6,9 ,11). A t first, p in 3 of IC 2 is h igh. W hen pin 14 ischanged high, pin 3 is low and the second output of IC 2 (p in 2) is becom e high. Soevery tim e pin 14 is high, the output is orderly changed another one.

P in 15 is a reset input and when it is high, the output of IC 2 is reached to pin 3at hig h.

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As soon as this circu it is connected w ith pow er supply , p in 3 of IC is h igh .W hen clapping one is done, the output of 555 (p in 14 of 40 17) is h igh and then thepin 2 of IC 2 is becom e high . The relay connected w ith pin 2 is energ ized and the firstou tpu t of the circu it is tu rned on .

The next clapping causes h igh the output of IC I (p in 14 of IC 2). T herefore, thep in 2 of lC 2 goes low and the output p in 4 is h igh . Then , the relay connected w ith p in4 operates to sw itch on the second output of the circu it.

S im ilarly , if the th ird clipp ing is done, the final ou tput of the circu it isenergized.

To turn offall ou tputs of the circuit and to reset the IC 2, pin 10 connected w ithreset input (p in 15) is caused by final clapping . S ince all re lays are deenergized , thepow er supply for the appliances is cu t ou t.

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Components list

SemiconductorDiode 1 N 4007 2Transistor TR) C945 4LED 4

Integrated CircuitsIC) - 555IC2-CD4017

ResistorsR) (10 kO)R2 (1.2 MO)R3 (2.2 kO)~ (150 kO)Rs (220 Jill)R6 (10 kO)R7, Rg,R9 (100 0) 3

CapacitorsC), C2 (0.1 f lF) 2C3 (4.7 f lF)C4 (0.01 f lF)Cs (1000 ~lF, 25 V)

MiscellaneousRelays, 12 V, 1000,15 A (single contact) 3Transformer 220 V to 12 VS), on loffswitchOutput SocketsCondenser mic

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