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External 5V power supply needed... not computer PS
releasedtruth:
Alright, I have an old HP pc running the cab, but it only has a 235w PS and my leds dim dramatically when connected. We're talking low power leds, maybe 50 of them. I've been running an extra spare 400w PS to power them, but would like something more trim and functional and no, the PS won't fit in the HP case. So other than a new case, what 5v power supplies are out there? Thanks
jimmy2x2x:
These are great value, offering a 12v and 5v supply from a pc standard molex.
Check delivery times!
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120575928009&ssPageName=STRK:MEWAX:IT#ht_3082wt_1137
releasedtruth:
Looks cool. Will that give me enough juice though?
jimmy2x2x:
Im really not sure :dunno
Its a handy little psu even if it doesn't fit the bill
mlalena:
Typical LEDs are only 20-30mA (milliAmps). So 50 LEDs are only 1 - 1.5 Amps total or 5-7.5 Watts. (Watts = Volts X Amps)
Even though the LEDs are closer to 2V, I am counting them as 5V because you are probably using resistors to drop the voltage and those resistors suck up power and convert it to heat.
So I am wondering if the LEDs you have are simply dim and there is no power problem. The only way to find out is to hook up a couple of them to prove that they aren't that bright. You may also have chosen a channel on the power supply that doesn't supply a lot of 5V power.
If you really need an external power supply, I would simply get a brick (think something like a cell phone charger) that was rated for 5V and more than 1.5A. Also, check the specs on your LEDs to see if they are really 20-30mA before purchasing anything.
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