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Home › Magazines › 2000 › July › Simple Touch Pad Dimmer

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Simple Touch Pad Dimmer

Published in issue 290, July 2000

Using a Power-FET it is possible to build a very simple touch dimmer for low voltage lamps. Two drawing pins are used here as the touch contacts. The electrical resistance of your skin is in the order of 100 k? to 1 M?. The circuit operates as an integrator with a capacitor in its negative feedback path. This configuration gives a relatively linear control characteristic.

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