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Is the lamp light burning too high? Is your engine spinning too fast? Do you want to reduce the speed of your fan, then this 220 volt dimmer circuit will make your work easier.
Materials for AC 220 Volt Dimmer Circuit;
BT139 TRIAC
500K POTENTIOMETER
10K RESISTANCE
DB3 DIAC
10 A GLASS FUSE
0.1UF 310 VOLT CAPACITOR