Tandem dimmer

Posted on Dec 28, 2012

This cross fader circuit can be used for fading between two slide projectors. As R3 is moved to either side of center, one triac is fired earlier in each half cycle, and the other iater.

Tandem dimmer
Click here to download the full size of the above Circuit.

The total light output of both lamps stays about the same for any control position.

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