Dimmer light switch circuit with Triac

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Dimmer with Triac tic225, potency control in loads as illumination of lamps.

Dimmers are devices used to lower the brightness of a light. By changing the voltage waveform applied to the lamp, it is possible to lower the intensity of the light output. Although variable-voltage devices are used for various purposes, the term dimmer is generally reserved for those intended to control light output from resistive incandescent, halogen, and (more recently) compact fluorescent lights (CFLs) and light-emitting diodes (LEDs). Dimmers range in size from small units the size of a light switch used for domestic lighting to high power units used in large theatre or architectural lighting installations.

Attention: circuit working directly with the net of high tension, risk of fatal shock, care when handling the equipment. Always of it turns off of the net of energy before moving in the circuit.

Diagram schematic Dimmer light switch circuit

Dimmer light switch schematic

Printed circuit board Dimmer light switch circuit

Dimmer light switch circuit led PCB Layout
Dimmer light switch circuit led PCB Layout

Lists of components for assembly of the dimmer circuit

R1: 10 K
R2: 2,2k
R3: 470K
R4: 330 Ohms 2 Watts
P1: 220K (* For power above 500W use a 2 or 3 Watts potentiometer.)

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C1, C2: 100NF /600V
C4: 47nF
T1: Triac 8A/400V TIC225D or equivalent
D1: Diac Ht32 or equivalent
Several L1: 100µH 5A
F1: Wires, printed circuit board, knob, box, solder, etc.

About the circuit

  • Use a small heatsink in the Triac.
  • You can use an incandescent bulb or LED lamp (dimmable), a fan, speed a drill, soldering iron temperature and more.
  • You must use a fuse to protect the circuit, this fuse will have a nominal value 30% higher than the load to which it will be connected.
  • Also optionally a switch can be used to turn off the circuit
  • The Triac to be used must be according to the load with at least 30% tolerance to the current. In relation to the voltage these should be at least 30% of the peak voltage where it is installed. The VPP is 155V in 110V and 311V in 220V.
  • You may need to change capacitor C1 to achieve full operation. Values between 69nF and 220nF can be tested.
  • Various TRIACs can be used according to your needs, only adapting the voltage and current you need. Common in market are Bta16-600, Bta16-700, Bta16-800, Bta41-600, Bta10-700, Bta12-700, T410-600, Bta24-800, Bt136-600, Tic226, TIC236, TIC246. Just watch out for the suffixes and codes of each Thyristor, because they tell you what current and what maximum voltage they support.
  • The lamp used be the dimmable type (dimmable, dimmable, DIM, attenuators, adjustable). Dimmer switches for led lights (dimmable) and Incandescent bulb.

Download files for this project – PDF PCB, Schematic in PDF, silk screen.
Download PDF      Mirror 1


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Crash Course Electronics and PCB Design
Crash Course Electronics and PCB Design
DC circuits, operational amplifiers, EXERCISES, SIMULATIONS
DC circuits, operational amplifiers, EXERCISES, SIMULATIONS