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Electronics Multiple LEDs to HD activity

Discussion in 'Modding' started by tornaxl, 17 Mar 2006.

  1. tornaxl

    tornaxl New Member

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    I am looking to connect multiple LEDs to my HD activity header on my motherboard. I am looking to uses these LEDs (http://www.thinkgeek.com/pcmods/lighting/809e/) but I know I just can't splice them into the motherboard.

    Can someone please let me know if what I want to do is possible. If so how?

    Thanks.
     
  2. Jokkocze

    Jokkocze New Member

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    Well, I'd use a relay. Connect the + (That should go to a led) to the relay, and connect the 12v (or is it 5?) to the relay, and then from the relay to the leds. Should do it. I aint that good at that stuff tho :/
     
  3. DR_D

    DR_D New Member

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    would the relay be able to pulse fastest enough with out destroying the contacts?

    what about an opto-coupler and some transistors?
     
  4. ARM

    ARM Member

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  5. tornaxl

    tornaxl New Member

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    Thanks for the replies. However, I am lost with this optoisolator stuff. If someone can provide a simple diagram of how to connect the HD leads to the optoisolator then to the 12v lead off the LEDs it would help out a ton.

    Thanks
     
  6. cpemma

    cpemma Ecky thump

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    A relay won't work, there's only about 10mA available. Opto-isolator is the best way.

    Most optoisolators won't carry the current for several LEDs in parallel so you need to add a current-boost transistor as shown in a few similar threads. :search:

    [​IMG]

    Get the opto datasheet to sort out the pins.
     
  7. bender386

    bender386 New Member

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    the other reason i would not use a relay is that when the switch they make a clicking noise. which would be very anoying if switching at those speeds.
     

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