Home Projects Motor, light and power control Triac based lamp dimmer


Triac based lamp dimmer
author: Rajkumar Sharma

Triac based Indecent lamp dimmer is a simple circuit and it doesn’t requires additional power supply, works directly with 110V AC or 230V AC.


It is a low cost dimmer circuit for adjusting the light brightness of incandescent, Halogen Lamp, Light Bulb load up to 250 W.


- Input supply: 230 VAC or 110 VAC
- Output: 250 W
- Triac controlled
- On board Potentiometer for adjusting level
- Power Battery Terminal (PBT) for easy input / output connection
- Four mounting holes of 3.2 mm each
- PCB dimensions 40 mm x 34 mm



Circuit description

This kit consists of BT 136 Triac, resistors and capacitor.  CN1 connector is for Load connections and CN2 connector for power supply connections.

BT136: It is a sensitive gate Triac, used in general purpose bidirectional switching and phase control applications where high sensitivity is required.

DB3: It is a DIAC that functions as a trigger diode with a fixed voltage reference.  It can be used in conjunction with Triac for simplified gate control circuits or as a starting element in fluorescent lamp ballasts


Working principle

This kit is used as a Light dimmer kit.  It is used to adjust the brightness of the Halogen Lamp, Light Bulb up to 250 W.  A power supply of 230 or 110 VAC is supplied to the kit at CN 2 connector and a light bulb is connected at the CN 1 connector.  Using the POT we can adjust the brightness of the bulb.



It is used to adjust the brightness of incandescent, halogen lamp, light bulb up to 250 W.


Parts List






120x90 spot



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