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Old Mar 01, 2012, 05:18 PM
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dedStik's Avatar
United States, VA, Virginia Beach
Joined Feb 2012
5,480 Posts
That's cool. I love to see old gear recycled, especially gear recycled doing something it wasn't meant to.
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Old Mar 02, 2012, 08:39 AM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Very nice, but you might want to post this in Batteries and Chargers forum - those folks are the ones that need this!
..a
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Old Mar 02, 2012, 10:05 AM
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Florida
Joined Aug 2004
4,163 Posts
A very nice conversion job. However, most computer power supplies are not quite so elaborate. You can find many write ups on the web on how to convert these power supplys to use with our chargers. In most cases, it is simply done by using the yellow (+) and any of the black leads as (-) for the 12 volt charging leads. You usually have to put a load on the 5 volt bus, red is + and any black lead for -, usually 5 ohm 10 watt resistor will suffice for the load. If you do not load the 5 volt bus, you will not get the full 12 volts out of the yellow leads (internal regulation is all based on the 5 volt bus). There is usually a green wire that has to be connected to ground (any black lead) to force the unit to turn on.
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Old Mar 05, 2012, 12:44 PM
ELECTRIC R/C
Jsutherland8's Avatar
INNERKIP,ONTARIO,CANADA
Joined Feb 2006
352 Posts
12 Volt +5v Charger Power Suply From Old PC

Quote:
Originally Posted by Rodney View Post
A very nice conversion job. However, most computer power supplies are not quite so elaborate. You can find many write ups on the web on how to convert these power supplys to use with our chargers. In most cases, it is simply done by using the yellow (+) and any of the black leads as (-) for the 12 volt charging leads. You usually have to put a load on the 5 volt bus, red is + and any black lead for -, usually 5 ohm 10 watt resistor will suffice for the load. If you do not load the 5 volt bus, you will not get the full 12 volts out of the yellow leads (internal regulation is all based on the 5 volt bus). There is usually a green wire that has to be connected to ground (any black lead) to force the unit to turn on.
All the new ATX Power Suplies do not need a 5 Volt load, to stay on, they have a power ON pin #14 that is grounded to activate the unit. A load on the 3.3 (orange) and 5 volt (red) line will often keep the 12 volt (yellow) line higher and more stable. The suply I used is already outdated for most of the Dual or Quad Core MPU's and motherboards in use now. The 24 pin header is now used more than the 20 pin ones. Soon the negative voltages (-5 and -12) will be taken out, as they are no longer needed, as there is NO ISA bus. These voltages were used in Phone Line Modems of the Dail Up type, that are now PCI or External High Speed type. Some of the new Micro Footprint and Carputers only need +12 volts in, and they use an internal DC to DC converter to get +5 and +3.3 volts.
Gone are the days of the simple transformer, bridge, caps, and some regulators, for a power suply, but the output is all the same !
I will try to get a link posted in the Charger Thread section.....Thanks......
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Old Mar 09, 2012, 10:39 AM
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snoopy_schulz's Avatar
Germany, lake of constance
Joined Oct 2010
407 Posts
Hi

I'm using also a pc power supply for my chargers. To keep the power supply running, i have loaded the +5V output with 1.8 Ohm.
It works now without any problems since 10 years.

Best regards
Micha
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Last edited by snoopy_schulz; Mar 09, 2012 at 12:13 PM. Reason: New pic
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Old Mar 09, 2012, 10:37 PM
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MAVA's Avatar
El Dorado Hills, California, U.S.A.
Joined Mar 2000
550 Posts
The guys in the " Battery's and Chargers" forum have a better mouse trap.

http://www.rcgroups.com/forums/showthread.php?t=1292514

Martin
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Old Mar 15, 2012, 12:23 PM
ELECTRIC R/C
Jsutherland8's Avatar
INNERKIP,ONTARIO,CANADA
Joined Feb 2006
352 Posts
12 Volt +5v Charger Power Suply From Old PC

This project seems to be very handy for all sorts of charging. The nice thing is the standby +5 volts going to the USB port. I use this with the USB LIPO charger for my 2.4 Ghz Micro Copter. The 0.5 Amp output is just right for one USB port and the rest of the unit is still off, good for energy friendly devices.
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