Capacitive dimmer switch circuit

Published:2011/6/25 9:28:00 Author:John | Keyword: switch | From:SeekIC

Capacitive dimmer switch circuit is as shown. It uses the principle of capacitance of capacitors for AC. When the S is at the shown position, bulb E normally lights with the maximum brightness. When it is dialed to position ②, light intensity of E decreases because of the insert of 2μF capacitor C1 in series. When it is allocated to the position ③, the brightness is reduced with a block because of increasing capacitance cause by C2 <C1. And when it is allocated to the position ④, the light E is off. C1 and C2 should use non-polar oil paper capacitor which can endure more than 400V voltage. And S is the 1 × 4 single-pole four-throw switch.



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