Sound-modulated light source

Posted on Jan 4, 2013

This circuit modulates a light beam with voice or music from the output of an amplifier. If the 10 K pot is adjusted to slightly less than the Vbe of the transistor, the circuit forms a peak detector

Sound-modulated light source
Click here to download the full size of the above Circuit.

This drives the gate of the SCR, lighting the bulb whose brightness will vary as the sound level varies. C2 may be removed for a faster response.

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