Connect with us

LED resistor value

Discussion in 'LEDs and Optoelectronics' started by glewis721, Apr 30, 2013.

Scroll to continue with content
  1. glewis721

    glewis721

    49
    1
    Apr 30, 2013
    if i am using 3.3 volts and a 1.5 volt LED, what value resistor should i use? (i don't know how much 1 ohm reduces the voltage):confused::confused::confused:
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,418
    2,788
    Jan 21, 2010
    The answer is 90 ohms (get a 100 ohm resistor).

    This assumes you want 20mA through the diode (which is a typical maximum value) and that the resat of the figures you've given are accurate.

    Click on the "tutorials" link above and look for the one on LEDs. There's lots of background material and also links to calculators that will assist you in doing the calculations yourself.
     
  3. glewis721

    glewis721

    49
    1
    Apr 30, 2013
    thanks!
     
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.
Similar Threads
Loading...
Electronics Point Logo
Continue to site
Quote of the day

-