GideonTech.com Forums

  • December 11, 2019, 01:46:19 AM
  • Welcome, Guest
Please login or register.

Login with username, password and session length
Pages: 1 [2]   Go Down

Author Topic: How to power an LED  (Read 4269 times)

-snake-

  • GT Fanatic
  • **
  • Karma: +0/-0
  • Offline Offline
  • Posts: 146
How to power an LED
« Reply #10 on: September 09, 2003, 05:47:14 PM »

I read a guide on this site about doing it and the guy uses a 100ohm resistor but another site had it directly plugged with no resistor wouldnt this blow it up?
Logged

I LOVE ED

  • Elite Modder
  • ****
  • Karma: +58018/-3
  • Offline Offline
  • Posts: 7,619
  • I am this forum's personal El Guapo
    • x24
How to power an LED
« Reply #11 on: September 09, 2003, 05:48:41 PM »

he used a LED rated 5v and he wired it directly to the 5v line.
Logged
My latest hobby: Down-voting QDB quotes from #geekissues.

-snake-

  • GT Fanatic
  • **
  • Karma: +0/-0
  • Offline Offline
  • Posts: 146
How to power an LED
« Reply #12 on: September 09, 2003, 05:52:31 PM »

I checked up on antecs site for my SX1040BII  and they dont specify what voltage of LEDs are in the front, is there a standard voltage for all leds infront of all cases?
Logged

I LOVE ED

  • Elite Modder
  • ****
  • Karma: +58018/-3
  • Offline Offline
  • Posts: 7,619
  • I am this forum's personal El Guapo
    • x24
How to power an LED
« Reply #13 on: September 09, 2003, 06:16:32 PM »

I don't think mobo manufacturers would even have the voltage outputted from the indicator headers (the LEDs in the front) on the specs.  But according to some people who tried to measure it, it's usually between 2-3v, and typical diffused LEDs (not those clear superbright ones but those stock LEDs included in cases) are rated around 2-3v also, if not lower.
Logged
My latest hobby: Down-voting QDB quotes from #geekissues.

broctannn

  • GT Fanatic
  • **
  • Karma: +0/-0
  • Offline Offline
  • Posts: 147
How to power an LED
« Reply #14 on: September 09, 2003, 06:28:10 PM »

no, the voltage is probably anywhere from 3.5 to 5v but why would you want to power a couple or orange or yellow leds to be allway on on the front of your case, hit lsdiodes.com and get some bloo or something that matches your color sceme
Logged

viridius

  • Moderator
  • Elite Modder
  • *****
  • Karma: +15/-0
  • Offline Offline
  • Posts: 4,258
  • You know what I mean.
    • http://www.getyourlanon.com
How to power an LED
« Reply #15 on: September 09, 2003, 08:01:38 PM »

Brutal has a good LED calculator on his webpage.    It's a simple application of Ohm's law (E=IR where E is EMF in volts, I is current in amps, and R is resistance in ohms).  Rearranged to solve for resistance, you get R=E/I where R is the resistance of the resistor you need to put in series with the LED, E is the difference between the LED's operating voltage (Vf), and I is the nominal current in amps that the LED runs at (Iop).
Logged
"I'm totally going to send ninjas after you." - BalefireX
Pages: 1 [2]   Go Up
 

Page created in 0.231 seconds with 19 queries.