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Sound Activated LED with an Electret Microphone

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Uploaded by on Oct 1, 2011

This circuit uses three NPN transistors to amplify the electronic signal of an electret microphone to light up an LED. My goal was to do this in the simplest circuit possible. This circuit is a mixture from a number of resources online.

A full schematic for the circuit can be found here:

http://www.ledhoops.net/2011/10/01/sound-to-light-with-an-electret-microphone/

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Science & Technology

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Standard YouTube License

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  • Is it reacting to your voice as well?

  • can you change the sensitivity of it? in diagram there is variable resistor(10Kohm) right?

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