TRIAC Light Dimmer


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This little circuit can be used to dim lights up to about 350 watts. It uses a simple, standard TRIAC circuit that, in my expirience, generates very little heat. Please note that this circuit cannot be used with fluorescent lights.

Schematic

This is the schematic of the TRIAC Light Dimmer

Parts

Part
Total Qty.
Description
Substitutions
R1150K Pot
R2115K 1/2W Resistor
C1, C220.068 250V Capacitor
L11Lamp To Be Controlled (up to 350 watts)
L21Neon Lamp
TR1140502 TRIAC
MISC1Case, Knob, Heatsink For TR1, Wire, Socket For L1

Notes

  1. This circuit is for 117VAC only. 220 or 240 V will burn up the circuit. L1 can be a maximum of 350 watts.
  2. The circuit must be installed and used in a case.

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Comments

Add A Comment

milan
TRIAC Light Dimmer
Wednesday, June 27, 2012 3:22:31 PM
it works... Although it's difficult to find 2N2222 & 2N3904 transistors

(Editor's notes: Those are the two most standard NPN transistors in the world.)

anonymous
TRIAC Light Dimmer
Monday, December 05, 2011 4:16:45 PM
has anyone modified the circuit to be used with 220V???
E. Murphy
TRIAC Light Dimmer
Tuesday, December 28, 2010 7:04:12 PM
Why follow the crowd? A neon bulb is a known gas discharge voltage reference. It may well be that it doesn't do as well as a diac, but let's face it, a light bulb dimmer ain't exactly rocket science! I'd thought (yesterday) of using one to reduce 120VAC to a clipped +/- 60 V or so, rather than use a step-down transformer for a zero-crossing detector. Why? Faster changing AC voltage going in than 12VAC would be to the comparator. Get a life, folks, independent thought that doesn't always look quite right keeps the brain stimulated. Or did you come from a modern college that crushes that?
anonymous
TRIAC Light Dimmer
Monday, March 08, 2010 5:50:14 AM
Much better if you will use a diac than neon lamp.
anonymous
TRIAC Light Dimmer
Sunday, March 29, 2009 2:43:20 PM
The neon lamp in the circuit above (L2) can be replaced with a diac. When the diac's breakover voltage is exceeded, the triac gets fired. What do you think of this modification?
asskicker
TRIAC Light Dimmer
Friday, March 06, 2009 11:03:29 PM
this project is very bad
anonymous
TRIAC Light Dimmer
Friday, January 30, 2009 10:44:42 AM
1: how can you make this use more channels (16 or so) and 2: what actually controlls the dimming of this and 3:will this work with leds and not have a flickering problem ??? If not how can you make it work with leds so there is no flickering problem as it is dimmed..
anonymous
TRIAC Light Dimmer
Wednesday, January 28, 2009 7:22:45 PM
Why does the circuit have a neon lamp? Can it be replaced, if so, by what?
anonymous
TRIAC Light Dimmer
Tuesday, August 05, 2008 9:48:59 PM
can i have circuit to dim DC by dimming AC only?
Ganesh Thenge
TRIAC Light Dimmer
Wednesday, June 25, 2008 3:10:20 AM
How the phase is controlled by triac?
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