Dc lamp dimmer

Posted on Nov 15, 2012    9600

A low power, low cost dc lamp dimmer for a two-wire portable `flashlight` can be realized with little or no heatsinking. In addition, a single potentiometer, R3 adjusts lamp brightness. Battery power is stored in Cl for Ul, which is a free-running multivibrator whose frequency is determined by Rl, R2, R3, R4, and C2.

Dc lamp dimmer
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Ul drives the gate of Ql, turning it and the lamp ON and OFF at a rate proportional to the multivibrator duty cycle.

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