Clap Switch Project

In this project, I have explained how to make a clap switch circuit using 4017 IC. With this clap switch, you can turn on or turn off any device with the clap.

How does a clap switch work?

• At first, the clap sound sensed by the condenser mic.
• The condenser mic converts the sound into an electric pulse.
• Then the electric pulse amplified by the BC547 transistor.
• After that, the electrical pulse fed to the CLK pin of CD4017 IC.
• For each high pulse at CLK pin the state of the PIN 2 changes.
• When the PIN 2 becomes HIGH, the second transistor turns ON.
• If the second transistor turns ON the Relay also turns ON.
• Now when the condenser sense the second clap sound, the next high pulse received at CLK PIN.
• The PIN 2 changed the state (becomes LOW), so the second transistor turns OFF.
• So the Relay turns OFF and the load connected with the relay also turns OFF.

Required Components:

1. CD4017 IC -1no
2. BC547 NPN transistors -2no
3. DC Condensor Mic -1no
4. 100nf (103) Capacitor -2no
5. 10k Resistors -2no
6. 270k Resistor -1no
7. 1M Resistor -1no
8. 220-ohm Resistors -2no
9. 1N4007 Diode -1no
10. LED 5mm 3volt -1no
11. 5v SPDT Relay
12. AC Lamp 220v/110v
13. 5v DC supply
14. Breadboard or PCB