Description
This project is a hardware clap switch that allows a lamp connected to AC power to be turned on or off by clapping hands or snapping fingers. It was developed for the electronics laboratory exam project at university and fully assembled and soldered on a veroboard.
The circuit detects sharp sound impulses and toggles the state of a lamp through a relay, enabling touchless control using sound. The system is powered by a 9V battery and controls a standard AC lamp safely through electrical isolation.
Main components used:
- Microphone
- 10µF capacitor
- 2 2N2222 transistors
- CD4017 decade counter
- 5V relay
- 1N4007 diode (relay protection)
- LED indicator
- 12kΩ resistors
- 1 1MΩ resistor
- 1 100kΩ resistor
- 1 56Ω resistor (relay current limiting)
- 9V battery
- Veroboard
- AC lamp.