GideonTech.com Forums

  • November 11, 2019, 08:04:25 PM
  • Welcome, Guest
Please login or register.

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

Author Topic: multiple HD leds  (Read 1538 times)

oldschoolnes

  • Elite Modder
  • ****
  • Karma: +0/-0
  • Offline Offline
  • Posts: 1,297
multiple HD leds
« on: January 12, 2004, 12:25:21 AM »

can i wire multiple LEDs in parrellel of the mobos led sockets.  like 3 or 4? if yes which leds can i use with what resitors.
Logged

viridius

  • Moderator
  • Elite Modder
  • *****
  • Karma: +15/-0
  • Offline Offline
  • Posts: 4,258
  • You know what I mean.
    • http://www.getyourlanon.com
multiple HD leds
« Reply #1 on: January 12, 2004, 12:39:46 AM »

The short answer is no.  The motherboard can only supply a finite amount of current to the LEDs.  Putting more in parallel might burn it out.  Use an optocoupler or a transistor instead.
Logged
"I'm totally going to send ninjas after you." - BalefireX

oldschoolnes

  • Elite Modder
  • ****
  • Karma: +0/-0
  • Offline Offline
  • Posts: 1,297
multiple HD leds
« Reply #2 on: January 12, 2004, 12:44:31 AM »

ok i have very little experience with electronics, what exactly will i need if i wanna use 4 leds? which leds and what not?
Logged

viridius

  • Moderator
  • Elite Modder
  • *****
  • Karma: +15/-0
  • Offline Offline
  • Posts: 4,258
  • You know what I mean.
    • http://www.getyourlanon.com
multiple HD leds
« Reply #3 on: January 12, 2004, 12:55:19 AM »

You can use any LEDs you like.  Just use Brutal's calculator to determine the resistor needed.  Then, buy a transistor like the TIP31C (should cost you less than $1).  Connect the base to the positive header for the LED on the motherboard, the collector to the 5 volt or 12 volt rail(whichever one you used to calculate the resistor), the emitter to one terminal of the resistor, the other terminal to the anodes of the LEDs, and the cathodes of the LEDs to ground.
Logged
"I'm totally going to send ninjas after you." - BalefireX

I LOVE ED

  • Elite Modder
  • ****
  • Karma: +58018/-3
  • Offline Offline
  • Posts: 7,619
  • I am this forum's personal El Guapo
    • x24
multiple HD leds
« Reply #4 on: January 12, 2004, 01:06:13 AM »

I have 6 LEDs as my HDD indicator.  I followed this circuit example but i've changed to a 4N28 instead of the regular 4N25, just to make sure i don't burn out the optoisolator.  I had the 4N25 for more than 6 months and it never burned out, but i replaced it with the 4N28 anyway.
Logged
My latest hobby: Down-voting QDB quotes from #geekissues.

oldschoolnes

  • Elite Modder
  • ****
  • Karma: +0/-0
  • Offline Offline
  • Posts: 1,297
multiple HD leds
« Reply #5 on: January 12, 2004, 12:01:48 PM »

i want to use the bottom diagrham (spelling)?  and u changed the chip for 6 leds? i dont understnad teh first diagrahm
Logged

I LOVE ED

  • Elite Modder
  • ****
  • Karma: +58018/-3
  • Offline Offline
  • Posts: 7,619
  • I am this forum's personal El Guapo
    • x24
multiple HD leds
« Reply #6 on: January 12, 2004, 12:32:28 PM »

the first diagram is just to show you what the chip and it's pins are.  The left side of the chip, with pins labeled A and K are pins to an internal LED.  when the LED is on, it turns on the transistor, which is on the right side of the chip, labeled B C and E.  So you connect your HDD indicator LED wires to the left side as if that's your HDD indicator LED.  Then you connect the C pin on the right to your power source, like the 5v line of your molex (red wire).  Connect the E pin to your limiting resistor, and then to the + end of your multiple LEDs wired in parallel.  the - leg of your LEDs will then be connected to the 5v ground line of your molex (black wire beside the red wire).

Now the value of the resistor will depend on how many and what rating of LEDs you're gonna use.  This is where LED calcs come in, or just use the limiting resistor formula (I have it in my post in the modders FAQ thread).
Logged
My latest hobby: Down-voting QDB quotes from #geekissues.

oldschoolnes

  • Elite Modder
  • ****
  • Karma: +0/-0
  • Offline Offline
  • Posts: 1,297
multiple HD leds
« Reply #7 on: January 12, 2004, 01:26:04 PM »

if i use 5v leds do i need a resistor?
Logged

viridius

  • Moderator
  • Elite Modder
  • *****
  • Karma: +15/-0
  • Offline Offline
  • Posts: 4,258
  • You know what I mean.
    • http://www.getyourlanon.com
multiple HD leds
« Reply #8 on: January 12, 2004, 06:16:30 PM »

Yes and here's why (it's near the bottom).
Logged
"I'm totally going to send ninjas after you." - BalefireX

oldschoolnes

  • Elite Modder
  • ****
  • Karma: +0/-0
  • Offline Offline
  • Posts: 1,297
multiple HD leds
« Reply #9 on: January 12, 2004, 08:35:41 PM »

so if i use 6 leds in parralle from that diagrhm (i cant spell)  and there 5 v leds i need a current limmitng resistor for each led, i know this sounds kinda lazy but can some one jsut tell the resistor i need instead linking me to a resistor calculator/
Logged
Pages: [1]   Go Up
 

Page created in 0.069 seconds with 20 queries.