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Sound Activated Switch

2013-09-03 Posted by:circuit Source:Internet Visits: Comment () Size:L M S

Summary:This is a sound activated switch circuit. Its 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.

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

Component Part:

R1, R5, R16 = 10kΩ
R3 = 22kΩ
R2, R6, R9, R13 = 220kΩ
R4, R10, R12, R14 = 100kΩ
R7 = 270kΩ
R8 = 4.7MΩ
R11 = 1MΩ
R15 = 330kΩ
R17 = 4.7kΩ
P1 100kΩ Trim Pot
C1, C3 = 10nF
C2, C4 = 100nF
C5, C6, C8, C9 = 1nF
C7 = 1μF/16V Electrolytic
C10 = 100μF/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 circuit

Download the manual instruction about the sound activated switch HERE
This circuit kit available at http://www.electronickits.com/kit/complete/elec/ck1607.htm, go to that page to buy the kit.

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