- on Miscellaneous Electronics
- Published in issue 7/2000 on page 0
Simple Touch Pad Dimmer
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.