Sound Controlled Activated Triggered LED

Posted on August 2, 2010 by Rust

When the microphone detects a loud sound, this circuit will turn the LED on. The “charge-pump” section consists of the 100n, 10k, signal diode and 10 uF electrolytic.   Here is the schematic diagram of the circuit:

SOUND TRIGGERED LED circuit schematic diagram

The charge pump section has two functions: rectifying and multiplying  the signal voltage. To illuminate the LED, a signal on the collector of the first transistor is passed to the charge pump section and finally drive the second transistor.

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