I used a triac to control the AC current to my led bulb 💡 but once the bulb is in on state, it's flickering.

I made a bridge rectifier and using transistor connected to triac, the input is given through PIR sensor

How can I reduce flickering, should I use a relay instead of triac. I just want to ON and Off based on pir sensor detects object

I read somewhere that it's because of small current.enter image description hereenter image description here

I did exactly same in this youtube video https://youtu.be/6Bua0g8HDIY

  • 1
    \$\begingroup\$ I don't think flatuation is a proper word. Flatulation is but that means fart. \$\endgroup\$
    – Andy aka
    Oct 4, 2020 at 11:29
  • 1
    \$\begingroup\$ Do you want the light bulb to be just ON or OFF, or should the brightness also be controlled ? If brightness control is also required, I do not think a relay alone can do it. Please edit into your question a circuit diagram representing your circuit, and the part numbers / values of the components used in the circuit. Also add the specifications of the LED bulb. Does it accept DC or AC ? If so at what voltage. \$\endgroup\$
    – AJN
    Oct 4, 2020 at 11:58
  • \$\begingroup\$ I use 20 w led tube light and want to ON and off based on pir detect object \$\endgroup\$
    – Sijith
    Oct 4, 2020 at 12:37
  • 2
    \$\begingroup\$ use a relay instead of that death-trap circuit. \$\endgroup\$
    – dandavis
    Oct 4, 2020 at 19:29
  • \$\begingroup\$ Current is probably too low for the hold-current of your TRIAC. \$\endgroup\$
    – winny
    Oct 11, 2020 at 20:26


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Browse other questions tagged or ask your own question.