December 97 Project : Hand Clap Electronic Control
We have all seen the commercial on TV .......... CLAP - ON - CLAP - OFF - THE - CLAPPER ............ well here is a circuit that will perform that same function.
Circuit operation is as follows. A single hand clap will be picked up
by the electric mic which is coupled through C1 into the op amp IC1. The ouput of IC1
triggers the 555 IC timer IC2 which is configured as a monostable multivibrater. The
trigger pulse is stretched by IC2 and outputs a pulse to IC3 a D type flip flop. Because
of the three state counter arrangement of IC3, two sharp claps are required before IC3
will output a high to Q1 which will turn on K1 relay and any device connected to K1's
switch contacts. Two more claps will clock IC3 again and will turn off Q1 and any device
connected to the K1's contacts. I had my unit connected to my xmas tree lights so that I
wouldn't have to crawl behid the tree to turn the lights on and off. Sensitivity for the
circuit is R3 and should be adjusted so that the circuit ignores normal room noise.
Hand Clap Electronic Control
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