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Old 2005.06.03, 10:22 PM   #1
arch2b
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Making a power supply out of a PC power supply unit

the title pretty much says it all....

i have a box full of pc power supplies and i need to make something for my gws charger. the average power plug has 4 wires; 2 black, 1 red and 1 yellow. which wires do i use for positive and negative for my charger? i don't have a volt meter or anything like that either
seeing how the pc power supply has atleast half a dozen plugs, would it be possible to use this as a power supply for more than one charger at a time?

one i have out of the cage already has the following stats;
300Watt
+3.3V = 14.0A (orange)
+5V = 30.0A (red)
+12V = 12.0A (yellow)
+5V = 0.85A (purple)
-5V = 0.3A (blue)
-12v = 1.0A (brown)
p.g. signal (white)
ground (black)
fuse rating 6.3A, 250V~
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Old 2005.06.03, 10:48 PM   #2
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i was thinking about making a charging station with this as well so is it possible to use an yellow/black wire for a standard 12v fan for colling cells while charging?

is it also possible to use an orange/black wire for running a motor break in station?
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Old 2005.06.03, 11:34 PM   #3
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I would get a cheap digital volt meter and mesure the output of the power supply. It is important to determine if the output is in DC volts not AC.
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Old 2005.06.03, 11:38 PM   #4
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thanks for the reply. nowhere on the lable does it mention ac or dc current. i might just have to make a run to rs tomorrow.

i assume the numbers i listed below are the volts and amps of each wire. for example the orange wire is listed as +3.3V = 14.0A. the volts would be good for breaking in motors but the 14.0A worries me, it seems very high?
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Old 2005.06.04, 12:23 AM   #5
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wire in a potentiometer, like the ones found at RS for replacing volume, gain, etc in guitar amps, then you can control the voltage and amperage output
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Old 2005.06.04, 03:44 AM   #6
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Quote:
Originally Posted by arch2b
the title pretty much says it all....

i have a box full of pc power supplies and i need to make something for my gws charger. the average power plug has 4 wires; 2 black, 1 red and 1 yellow. which wires do i use for positive and negative for my charger? i don't have a volt meter or anything like that either
seeing how the pc power supply has atleast half a dozen plugs, would it be possible to use this as a power supply for more than one charger at a time?

one i have out of the cage already has the following stats;
300Watt
+3.3V = 14.0A (orange)
+5V = 30.0A (red)
+12V = 12.0A (yellow)
+5V = 0.85A (purple)
-5V = 0.3A (blue)
-12v = 1.0A (brown)
p.g. signal (white)
ground (black)
fuse rating 6.3A, 250V~

First off. A computer power supply does not put out AC power. Second, a computer power supply one puts of 12v max. The 3.3v and such are for your 3D AGP cards, etc.

What you will have to do first off, is find which two pins turn the power supply on and off (if it's an ATX power supply). Once you have done that, the next part is easy. Just wire it all up so each batter receive around the 3v mark each. That way, it will charge them faster than a normal 1.5v - 2v charge rate.

I personally would scrap the other voltages, and just use the +/- 12v. Just connect each battery in parallel that why they all receive the same voltage. If you really want to get technical, you can rig up a control circuit that turns off the power supply when the batteries are charged.
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Old 2005.06.04, 11:04 AM   #7
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thanks for the info

what i would like to do is use the pc power supply to run 2 battery pack chargers, a tiny 12v fan and as many mini-z motors at the least voltage rating for break-in as i can.

it's an atx ps from a win98 machine. it has 4 component plugs, 1 main board plug and one additional one that wasn't hooked to anythhing for a wire count as follows;
6 orange
9 red
5 yellow
18 black
everything else has 1

what did you mean by this?
Quote:
What you will have to do first off, is find which two pins turn the power supply on and off (if it's an ATX power supply).
i was kind of hoping i could use the wire chart provided and simply cut and run wires but it's looking to be much more complicated
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Old 2005.06.04, 12:55 PM   #8
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As long as the 20 pin plug is the same, the instructions should allow you just cut and run wires.
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Old 2005.06.04, 12:57 PM   #9
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why would i need the same plug? i wanted to cut off all the pc plugs and either hardwire or use deans plugs
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Old 2005.06.04, 01:12 PM   #10
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the 3.3v orange wire rated at 14 amps will give up to 14 amps of current. that doesn't mean that it will always give 14 amps...look at that wire as a li-poly battery rate at a certain amps...it won't always deliver that current(in fact you would need a crazy hot motor to do that!)it depends on the motor you put on there to break-in...for example a k xspeed draws about .6 amps so if you hook it up to the power supply it will only draw .6 amps from the supply assuming there is no load.
with charging though you must be careful because the wire delivers all the current to the batteries(it almost acts like a short!)
I'm sure you can use it just be very careful with shorting the wires(that power supply can go up in smoke!)
Most chargers use a small power supply...for example my lithium-ion charger's power supply is rated at 12v at 300mah(its particularly slow)
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Old 2005.06.04, 01:20 PM   #11
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i can adjust the amps for charging on my gws charger. i had no intention of hooking this directly to cells as i've always asked about kooking this to cell pack chargers. there is the possibility that this makes no difference in what you guys are telling me as i know little if anything about larger scale electronics YET. i am learning though

it's my understanding that so long as i have a 12v positive line it should power the chargers fine and thus the cell packs, correct?

the key is for you electronics experts to break it down in simple yet clear terms for me and others to understand
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Old 2005.06.04, 02:40 PM   #12
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Quote:
What you will have to do first off, is find which two pins turn the power supply on and off (if it's an ATX power supply).
ok, i understand what your saying.... i pluged in teh psu and cut some of the wires and none of them are live. so, just like you said i have to find the wires that are responsible for switching the power one and install a switch i guess? anyone know where to even begin to look for these wires? it's all pretty much useless until i can find them or a way to rig it ti wire a power switch.

does anyone have suggestions for other places to ask? i was hoping to get this done this weekend.
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Old 2005.06.04, 03:36 PM   #13
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Yes, clip off the plug ("cut and run the wires"?). but I was refering to MARCEE. Is your plug different than that one?
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Last edited by Ken Mifune; 2005.06.04 at 03:39 PM.
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Old 2005.06.04, 04:28 PM   #14
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Here's the link again for those interested but didn't happen to read my post in arch's other thread.
http://www.marcee.org/Articles/PCPowerSupply.htm
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Old 2005.06.04, 04:52 PM   #15
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thanks for that link!!!!
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