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Old May 08, 2005, 07:44 PM
Jason
super_nova's Avatar
United States, SC, Rock Hill
Joined Jun 2004
878 Posts
looking for DIY 12 volt power supply instructions

Hi Guys, could someone tell me where I can find directions on how to create a 12 volt power supply (to power a charger or two in the shop) from an old computer power supply? Or if someone has some they could send me please let me know!

Thanks,
Jason
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Old May 08, 2005, 10:20 PM
Registered User
Manila, Philippines
Joined Jul 2004
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its Cheaper just buy a Ready-made 12 Volts Power supply from a Surplus store, I use a NOTEBOOK power supply with 12 Volts 4 Amps, for my Super_NOVA 250S from FMA Direct.......check the INPUT VOLTAGE RANGE of your Charger, cause same charger can accept 12 to 24 Volts.......its very common to find a 18 to 21 Volts Notebook power supply.......I just got lucky to find a 12 volts 4 Amps.

The notebook power supply I got, is almost the same size as my Super Nova Charger.

my friend use a computer power suppply, just need to put some load resistor on 5 Volts output a 10 ohms 5 Watts....some power supply need a mininum load of 0.5 Amps in order to work properly.

Ellion
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Last edited by lazy-b; May 08, 2005 at 10:25 PM.
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Old May 09, 2005, 12:14 AM
Senior Member on Melmac
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Evergreen, CO
Joined May 2003
138 Posts
Really simple. get an ATX power supply (not an AT) - on the large power connector you will see a green wire (the only one), just ground it to any black (or use an SPST switch). That will enable turn on the power supply and enable 12v output for you.
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Old May 09, 2005, 09:46 AM
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On most you also have to put a load on one of the 5v output lines (usually the red wire in the 4 wire harnesses). A 12v automotive light bulb between any pair of red and black wire is about the right load and gives a visual indication that it is "On".

Adam
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Old May 09, 2005, 11:06 AM
MRP
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Cambridge, UK
Joined Oct 2001
166 Posts
Quote:
Originally Posted by super_nova
Hi Guys, could someone tell me where I can find directions on how to create a 12 volt power supply (to power a charger or two in the shop) from an old computer power supply?
Hi Jason,

Is this the kind of thing you are after ?

http://web2.murraystate.edu/andy.bat...owersupply.htm

I think there is something on the Dream Models site too.

If you already have an old PC power supply available this has got to be the cheapest way - but if you don't there are now lots of regulated supplies at 12v or 13.8 that will do the job nicely.

Cheers
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