Light Transmitter

Posted on Oct 18, 2012

This circuit modulates the current through a lamp filament. Use a low-voltage lamp with a thin, straight filament. They h

Light Transmitter
Click here to download the full size of the above Circuit.

ave a fast response to filament voltage variations, dc is applied to "bias" the filament that is on, and the audio is superimposed. A BC457 drives a TIP147, which modulates the filament current.

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