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20 Jul

Sound Activated Switch - Schematic Design

This is a sound activated switch circuit. It’s will turn on and turn off based on a loud sound such as clapping your hands. You can adjust the sensitivity (how loud of a sound will activate the circuit) from a pin drop to a Mack Truck Horn. Very practical for a variety of projects. Add a relay to turn on a light when your dog barks, or set of a siren when an intruder makes a loud noise.

Here the circuit diagram:

Sound Activated Switch circuit diagram

This circuit operates on 9 VDC battery or you may use a DC power supply instead of a battery. Electret microphone used to catch the sound (very sensitive). The sensitivity can be adjusted via potentiometer.

Components List:

R1, R5, R16 = 10k?
R3 = 22k?
R2, R6, R9, R13 = 220k?
R4, R10, R12, R14 = 100k?
R7 = 270k?
R8 = 4.7M?
R11 = 1M?
R15 = 330k?
R17 = 4.7k?
P1 100k? Trim Pot
C1, C3 = 10nF
C2, C4 = 100nF
C5, C6, C8, C9 = 1nF
C7 = 1uF/16V Electrolytic
C10 = 100uF/16V Electrolytic
Q1 = 2N3904
Q2 = MPS6531
U2 = 4001 Integrated Circuit
U1 4011 Integrated Circuit
LED = LED Red
MIC = Electret Microphone

PCB Layout:

Sound Activated Switch pcb design

Download the manual instruction for this sound activated switch circuit:

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