Wednesday, September 5, 2012

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Triac Light Dimmer Circuit

This is a simple 220V light dimmer circuit based triac can be used to adjust the brightness of mains lights about 350 watts. It also can be used to adjust the speed of AC motors. It uses a triac, diac and has a radio-frequency interference (RFI) noise suppression circuit built into it as well. Please note that this circuit cannot be used with fluorescent lights.
Triac Light Dimmer circuit
List Component of   Triac Light Dimmer circuit
R1     : 50K Pot
R2     : 15K 1/2W Resistor
C1, C2 : 0.068 250V Capacitor
L1     : Lamp To Be Controlled (up to 350 watts)
L2     : Neon Lamp
TR1    : 40502 TRIAC 
  • This circuit is for 117VAC only. 220 or 240 V will burn up the circuit. L1 can be a maximum of 350 watts.
  • The circuit must be installed and used in a case. 
  • Heat sink is necessary for 40502 TRIAC 

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