Wednesday, February 2, 2011

Simple Lamp Dimmer 220V using Triac

A very simple dimmer circuit with only the essentials. (In this circuit, the values are given for a BT138 at 220V AC, for 115V AC you may have to experiment with the values.)
Simple lamp Dimmer 220V Circuit
  • D1 = diac (silicon bidirectional trigger device) BR100, ER900 or similar
  • Tr1 = triac BT138, TIC226...
  • This circuit is potentially dangerous! this is nothing for beginners!
R1 can vary from one triac to another, put a 220KΩ trimmer in its place and adjust. After adjustment, measure the result and replace the trimmer with an ordinary resistor of the same value.

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