Clap ON OFF switch

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This clap operated ON OFF Switch circuit is very sensitive and easily operated upto distance of 5 Meter If condenser MIC is fix into a Special type of Cover to Receiving More Sound From Maximum Distance.

This Clap/Sound controlled ON OFF Switch circuit consists two ICs , two NPN transistors, One PNP Transistor and some other components.

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Clap on off switch circuit diagram.JPG

The LM358 is an opamp-comparator which has two Op-Amp in a single ic chip. This ic is dual operational Amplifier But in this circuit one op-amp is used.


Connect All the required components as Given diagram. Enclose condenser microphone to As possible as maximum sound Reach easily to this . Use all the Resistors as given value for more sensitivity and set the preset by moving. You can use 2N2222 Transistor as the place of 548. 2N2222 has fast switching Keep in mind to Condenser MIC has polarity , So if the circuit is not working then check the polarity of MIC. Pin Configuration of BC548 and BC558 is same.


IC 4017 is a decade counter which has 10 outputs , Outputs are ON one by One in sequence as Clock Input at pin 14 is changes. When once Clock input is changed then output is goes at next. When Again the clock input is changed at pin14 the output is goes at next output pin and so on. Pin-2 is the output 1. It goes high when the counter reads 0 counts.

Pin-4 is output 2. It goes high when the counter reads 2 counts.

Clock input change means the input of pin 14 is changed with Negative to Positive voltage supply Or Reversed. When Clock input is changed then the output of 4017 is changed From High to Low And Low to High. This Property is used in this project.

IC 358 is Dual Opamp Comparator Which Compare the input signals Level at inverting and non inverting input pins as Low or High signal valtage Level in respect with both pin. This ic has two input, inverting and non inverting. Inverting input is called as Vref. Non inverting input is called as Vin. The output of comparator is depend on voltage level of these both input. mic no detects any sound and at this condition the resistance through this is Very high and The voltage level at the pin 2 (Vref) is Very Less in compare with Pin3 (Vin). In this case the output is 0.

When clap, the sound is detected by condenser mic and the resistance between vcc and pin 2 is very less and voltage level get increase in compare with the voltage level between vcc and pin3. In this case the Output is changed and it is now Turn Low to High .

As the signal input at pin 14 of 4017 in changed as the output at pin 2 is changed from Low to High. Again When the input at pin 14 is changed ,the output at pin 2 is changed from High to Low.

According the output of pin 2 transistor Q3 is Turn ON and OFF and Relay Activate therefore the Appliance is ON OFF By clap.

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Clap on off switch


ID Name Designator Footprint Quantity
1 LM358D U1 SOIC-8_150MIL 1
2 HEF4017BT U2 SOP-16_150MIL 1
3 BC547B Q1 TO-92(TO-92-3) 1
4 BC557B Q3 TO-92(TO-92-3) 1
5 2222A Q4 SOT-23(SOT-23-3) 1
6 5k R1VR RES-ADJ_3386P 1
7 1k R2,R4,R8 AXIAL-0.3 3
8 STW-6027-Z MIC1 ECM-6*2.7 1
9 10k R3 AXIAL-0.3 1
10 2.2uf C1 CAP-D3.0XF1.5 1
11 3.3k R5 AXIAL-0.3 1
12 33k R6 AXIAL-0.3 1
14 1N4007 D1 DO-41 1
15 230v AC V1 HDR1X2 1
16 BULB H1 IND2-N10 1




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