800 W soft start light dimmer

Posted on Feb 5, 2014

This circuit shows the basic UJT building block (Fig. 9-1), which is used in a light dimmer with soft-start operation that applies current to the light slowly enough to eliminate high surges (high inrush current). These current surges, found in most cold-filament light dimmers, shorten lamp life. With this circuit, the lamp is heated slowly by a g

800 W soft start light dimmer
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radually increasing voltage so that inrush current is kept to a minimum. R4 controls the charging rate of C2 and provides the means to control or dim the lamp.

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