Simple Lamp Dimmer Fan Regulator


Posted on Feb 7, 2014

The circuit works by varying the firing angle of the Triac. Resistors R1, R2 and capacitor C2 are associated with this. The firing angle can be varied by varying the value of any of these components. Here R1 is selected as the variable element. By varying the value of R1 the firing angle of Triac changes (in simple words, how much time should Triac


Simple Lamp Dimmer Fan Regulator
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conduct) changes. This directly varies the load power, since load is driven by Triac. The firing pulses are given to the gate of Triac T1 using Diac D1. Assemble the circuit on a good quality PCB or common board. The load whether lamp, fan or any thing, should be less than 200 Watts. To connect higher loads replace the Triac BT 136 with a higher Watt capacity Triac. All parts of the circuit are active with potential shock hazard. So be careful.




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