Clapper Switch (Clap-On, Clap-Off)
Topics: Sound Circuits / Sound Activated
Everybody wants a light clapper, or a way to clap on or clap off something, without having to physically get get up and flick a switch. Enter the Clap Switch!
This is the schematic for a clap switch, also known as the "Clapper". It will all you to clap on/off your lights, or just about anything else.
The circuit is made of a microphone (clap detector), an operational amplifier (op-amp) 741, a 555-timer behaving as a monostable multivibrator, a D-type flip-flop, and a relay which will allow you to switch on/off just about anything. The constructor of this kit used it to turn on and off the christmas lights - awesome!!
Full operation of the circuit is explained by the author. The gain of the input op-amp is adjustable so that the noise sensitivity can be adjusted. You will probably need to calibrate it so that it detects claps effectively in your room's environment.
Clapper Components/Parts List:
- IC1 = 741 OP-AMP
- IC2 = 555 Timer
- IC3 = 4013 Dual D Flip Flop
- Q1 = 2N222 NPN Transistor
- ----
- C1,C2,C3,C4 = 0.1 uF Disc
- C5 = 47 uF Electrolytic
- ----
- R1,R2,R4,R5,R10 = 10,000 Ohms (10k)
- R6 = 150,000 Ohms (150k)
- R7,R9 = 100,000 Ohms (100k)
- R8 = 1 MegaOhm
- R11 = 220 Ohms
- R3 = 100,00 Ohm Trim Pot
- ----
- B1 = 9 Volt DC Battery
- K1 = SPST Reed Relay 5 Volt DC Coil
- MIC = Electric Microphone
- Clap Switch
- Clapper Switch
- Clapper Schematic
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- Clap Switch Circuit
this site is awesome... it really feels great learning the wonders of the electronic world...