clap, human voice, audio systems, cell phone ring when the circuit is near the cell phone.
The heart of the circuit is an LM386 IC. The circuit is simple and using only few external components. Working of the circuit is simple, the electret mic receives the sound signals and changes them in to electrical signals these electrical signals are amplified by the LM386 IC and comes from its pin5 and activate the LED connected to its pin5 through a 100uF capacitor. Operating voltage of the circuit is 9V to 12V DC.
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Here is a project of a sound activated LED using LM386 audio amplifier IC. LM386 is a famous low power audio amplifier IC used with many audio projects. The IC can also be used to make a good quality sound detector or sensor circuit. The circuit will activate / blink an LED on any sound like whistle, clap, human voice,

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Sound Activated LED Using LM386 Audio Amplifier IC