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More power to HDD led pinout?

post #1 of 5
2/4/11 at 1:39am
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Sorry if this is too off topic, but I'm after running more LED's in parallel off the HDD header on a motherboard.

Dunno if hacks like this are for discussing here or not sorry.

I have a wee project I'm working on, and essentially want more power/lights to go when there is hdd activity.

Just wondering if I take a -5v rail and connect it to -ve on the hdd led header will it melt everything? or can a transistor gateway be simply made from parts that would switch the load? Not too interested in exact forward bias of the leds etc, as they are typically on momentarily. I just did a min/max reading on the pins and got a max of 4.68v while the hdd was searching for all .dll's

This is for a lab machine so I wont lose too much sleep if it fries.

Thanks in advance...
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post #2 of 5
2/4/11 at 1:41am
I honestly don't see this working. Why not put a resistor inline with the LED instead? Assuming of course, that you're not using 12v LED's, and that's your problem.
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post #3 of 5
2/4/11 at 1:49am
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Nah they are just little white bulbs out of a handheld torch... I want to add more but there just doesnt seem to be enough juice for it.. they are in parallel tho... would that make much of a difference?
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post #4 of 5
3/29/11 at 9:27am
I'd put together a transistor gate, and is it possible to wire them in series? Parallel can be tricky; they'll draw more current and they all need to be identical components.
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post #5 of 5
7/31/11 at 10:18pm
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This is what transistors are made for. The mobo is able to sink/source maybe 20ma tops. Anything more and you're going to let the smoke out.

Check out:

http://www.kpsec.freeuk.com/trancirc.htm#npn
Edited by Dyson Poindexter - 8/1/11 at 7:43am
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