Simple Clap Switch Using IC 741 and 4017
Circuit Description :-
Today we are going to make a simple clap switch circuit.This is a simple clap switch circuit with high sensitivity. It switches ON/OFF electrical appliances through claps.In the circuit, I will control a single relay using clap switch. The circuit can sense the sound of claps from a distance of 1-2 meters.
The main component of this circuit is the Electric Condenser Microphone, This Microphone used as a sound sensor and converts sound energy into electrical energy,
this circuit is mainly based on the two ICs i.e. Op-Amp.741 and CD4017. IC CD4017 which is a CMOS counter/divider IC.
- IC 4017 – 1
- IC 741 – 1
- Resistors(10K) – 2
- Resistors(1K) – 4
- RED LED – 1
- Diode (1N4007) – 1
- Green LED – 1
- Microphone – 1
- Relay(9v) – 1
- BC547 – 1
- variable resistor(10k) -1
- Battery / Adapter(9V) -1
In (IC 4017) 8 no. pin connected to GND and 16 no. pin connect to 9 volt
PCB of Clap Switch Circuit
I have made a simple PCB circuit for the above mentioned clap switch circuit.you can also try on zero PCB Boards.
When you clap or any sound of approximately same pitch of Clap sound. this sound signal is converted into the electrical signal by the condenser microphone.These sound vibrations are given to the inverting input of IC 741 and Its amplifies the sound collected by the Microphone.Resistor R1,R2 and VR2 variable resistor adjust the sensitivity of the amplifier.Resistor R3 set the sensitivity of Microphone.The amplified output pulses from IC1 (IC 741) passes to the input of IC2 (CD 4017). CD4017 receives a clock signal through the clock input and it turns ON all the 10 outputs one by one, every time it gets the clock input pulse.When you clap once, the relay is activated and the Fan (or any load) is turned ON. When you clap for the second time, the relay is deactivated and the Fan is turned OFF.
Clap Switch Circuit Summary
- this circuit is helpful for you If you wish to ON and OFF the device or electrical appliances through claps without moving from your place.
- You can also control speed of the fan by connecting regulator with individual outputs of CD4017.
- The other use of this circuit is that there is no fear of the electrical shocks as you are not required to touch any of the mechanical switches physically.