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| Clap switch circuit |
The electret microphone picks up the sound of your claps, coughs, and the sound of that book knocked off the table. It produces a small electrical signal which is amplified by the succeeding transistor stage. Two transistors cross connected as a bistable multivibrator change state at each signal. One of these transistors drives a heavier transistor which controls a lamp.
It works even if you omit that 4.7 Megohm resistor. The transistor types are not critical and any n-p-n silicon transistors should work.
i didn't understand the circuit please can you help ?
ReplyDeleteHere the condenser mic (electret mic) is used to pick up the sound waves of clap.
DeleteThe mic signals the amplifier stage of the circuit ie the 1st BC547 transistor.
The amplified signal is then input to the next stage that is the criss cross transistor stage( bistable mv - where we are having the two bc547).
When we get high input to this stage , the state of the transistors T2 and T3 changes.
The output of MV stage is input to the next amplifier stage, here BC337.
The output of amplifier is feed to the element to be switched on or off.