Today we will build a circuit activated by clapping sounds. This allows you to open or close a circuit by clapping your hands.
This circuit is made using a sound sensor, which detects the loud sound (of clapping) as input and sends it to the circuit to give the output. When the sound is given as input to the Mic, it is transformed into electrical energy and makes the LED light up. The LED after some time automatically turns off. The 100uF capacitor is used to set this time.
To increase the sensitivity of the Mic, the variable resistance in the circuit can be varied. The IC 555 has been configured in monostable mode.
Schematic
Bill of materials (BOM)
- 1x IC NE555
- 1x 47K Ohms resistor (R1)
- 1x 1K Ohms Resistor (R2)
- 2x 470 Ohms Resistor (R3, R4)
- 1x 10K Ohms Variable Resistor (RV1)
- 1x Red LED 5mm (D1)
- 2x 2N2222A NPN Transistors (Q1, Q2)
- 1x 100uF Electrolyte Capacitor (C1)
- 2x 100nF Ceramic Capacitors (C2, C3)
- 1x Mic electrec (MIC1)
IC/Components Pin-out
