The switch of loading from sound signals. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches

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The device is designed to turn on / off the load from sound signals, such as clapping hands.

The scheme is as follows:

(click to enlarge)

The cotton received by the microphone and amplified by the transistor VT1 is fed to a monostable multivibrator, made on an integral timer DD1. A D-trigger on a DD2 chip is connected to its output, which changes its state to the opposite with each pulse entering from the multivibrator. In short, it all works like this - slammed once - the relay closed, slammed a second time, the relay opened.

Such is the dialectic.

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Publication: radiokot.ru

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