sound activated lamp relay switch


Posted on Feb 6, 2014

This simple circuit shown int the schematic diagram actives the switch using sound. We can use this circuit for various applications, such as automatic (sound-controlled) disco light or car`s LED light show. The Q1 amplify the audio from mic. The R1 is used to adjust the peak of signal to greater than about 0. 7 volts, act as sensitivity adjuster.


sound activated lamp relay switch
Click here to download the full size of the above Circuit.

A certain level, the signal coming from microphone, after amplification by Q1, will trigger the SCR and light lamp I1. If we change the lamp with a relay, then we can get a sound-activated relay/switch, which can be used to control more powerful / high wattage high voltage lamps.




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