800Watt light-dimmer


Posted on Jan 20, 2013

This wide-range light dimmer circuit uses a unijunction transistor and a pulse transformer to provide phase control for the TRIAC. The circuit operates from a 115 volt, 60 Hz source and can control up to 800 watts of power to incandescent lights. The power to the lights is controlled by varying the conduction angle of the TRIAC from 0° to about 170°.


800Watt light-dimmer
Click here to download the full size of the above Circuit.

The power available at 170° conduction is better than 97% of that at the full 180°.




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