Triac based lamp dimmer

  • Rajkumar Sharma
  • 28171
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  • easy
  • Tested

F001

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.

Description

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

Features:

– 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

Schematic

SCH

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.

Applications

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

Parts List

BOM

 

PCB

Comments

  • Rey Hidrógeno

    Great Article! =D

    3 years ago
    • Rey Hidrógeno

      Rajkumar Sharma, forgot place your name! 😉

      3 years ago
  • FTG

    Tested the circuit, not working. Its a piece of…of not working electronics.

    2 years ago
    • Adrian Andrei

      What you should test first is your electronics knowledge and skills. Next time try something simpler, maybe involving less than 5 electronic parts…

      And now, seriously, take care about the P1 (470k pot.). Must have at least 0.25W power dissipation.

      2 years ago

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