. .
  1. #1
    As it says on the "Tin":



    .Me

  2. #2
    Quote Originally Posted by Lee Roberts View Post
    As it says on the "Tin":



    Just be careful, that equation assumes the LED requires 20 milli Amps of current, the proper equation is (Vsupply - Vled) = IR, or R = (Vsupply - Vled) / I in this case. V is in Volts, I is in Amps, and R in Ohms.

    20 mA = 0.020 Amps.

    Some minature LEDs go pop on less than 20mA :)

    Technically speaking LEDs require a certain current, not a certain voltage, so it is possible to run a LED from a higher voltage supply without a current limiting resistor, as long as the supply is switched so that the average current is at or below the LEDs forward current.
    Last edited by ZeroCount; 17-03-2009 at 12:58 AM. Reason: Additional information
    The more I learn about this hobby, the brighter the light of knowledge grows, the deeper is the pit of ignorance revealed...

  3. #3
    I'm using this online calculator - you will also get the power requirements for the resistor - it calculates the Wattage of the resistor - depending of the voltage of the circuit

    http://led.linear1.org/1led.wiz

  4. The Following User Says Thank You to karul For This Useful Post:


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. cnc machine stiffness calculator
    By routercnc in forum Linear & Rotary Motion
    Replies: 13
    Last Post: 02-09-2022, 04:32 PM
  2. Simple O-ring calculator.
    By jcb121 in forum General Computing
    Replies: 4
    Last Post: 26-07-2013, 09:00 PM
  3. Resistor Question
    By GTJim in forum General Electronics
    Replies: 1
    Last Post: 07-04-2013, 10:01 AM
  4. ATX power supply - load resistor - do I need one ?
    By rckeith in forum General Electronics
    Replies: 4
    Last Post: 18-08-2010, 03:21 PM
  5. What type of resistor?
    By Smiler in forum General Electronics
    Replies: 4
    Last Post: 05-12-2008, 10:04 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •