Connect with us

LED will not turn off with pot

Discussion in 'LEDs and Optoelectronics' started by wingnut, Jul 22, 2019.

Scroll to continue with content
  1. wingnut


    Aug 9, 2012
    Hi all

    Can someone please tell me why the LED does not dim completely when the sweeper is fully at ground. Thanks.

    My apologies, its dimming completely now. I think the ground of the pot was not making contact.

    Last edited: Jul 22, 2019
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    A potentiometer is not a good way to control the brightness of a LED. A potentiometer is not designed for comparatively high currents as required for a LED. Use the potentiometer instead to control a transistor which drives the LED current.
    A modern way of controlling LED brightness is by using PWM. Much less power dissipation at the cost of higher parts count.
    Last edited by a moderator: Jul 29, 2019
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day