Search: Posts Made By: dmccormick001
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06-13-2017, 03:45 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

Most ATX PSUs have a small gauge brown wire that...

Most ATX PSUs have a small gauge brown wire that is a "sense" wire, it must be connected to the 3.3 volt (orange) rail. Look at the 24-pin connector that goes to the motherboard, you'll see that it...
10-21-2009, 08:36 AM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

I've run into this problem several times with PSUs I've converted for some of my buddies. To expand a little bit on what Andrew is saying, connect the charger AND TURN IT ON before you power up the...
05-10-2009, 12:45 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

If you are planning to use one of these PSUs to power a battery charger that will pull several amps, I strongly recommend you use more than one yellow wire to provide your 12 volt output. I'd use at...
05-06-2009, 07:36 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

What color is your LED? Different color LEDs have differing forward voltages, and that will determine the correct resistor value for yours. If you know the forward voltage of yours, here's a handy...
05-06-2009, 06:56 AM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

99GT:

I knew if you could get Andrew in on your question, you'd get the correct info. Sorry I mislead you on that gray wire, I haven't run into that even though I think I've converted some...
05-05-2009, 09:29 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

If the PS is "rated" at 6A, you probably won't get that much out of it under the best of circumstances. There are a lot of factors that go into the reason why, but the bottom line is, if you need 5A...
05-03-2009, 09:18 AM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

1. Do you know for sure that the PSU was functional before you began converting it?

2. Have you checked the unit for voltage output on the 5 & 12 volt rails, or are you just watching the fan? ...
04-21-2009, 04:12 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

Theoretically, yes, because the result would be the equivalent of a 1/4 ohm 10 watt resistor, which would push the voltage up on all the rails slightly more than what you have now, but only by...
04-18-2009, 09:46 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

So you basically have a 1 ohm 40 watt resistor on the 5 volt rail? That's what you get if you put two in series (2 ohms) and then parallel them with two more, which drops the resistance of the four...
03-05-2009, 03:04 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

The gray to black might be the problem. If memory serves me, the gray wire is used to supply power to LEDs that remain on while the main supply is on standby, if you have it grounded it might be...
03-02-2009, 03:57 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

Yeah, it sounds like the PS circuitry is sensing the sudden presence of the charger as an overload condition and is shutting it down, whereas if you connect the charger before you turn the PS on, the...
03-02-2009, 10:21 AM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

Yes, you probably need to short the green wire to ground even if there is a switch on the unit's case. The built in switch usually just controls the 110vAC line coming into the supply, providing a...
03-01-2009, 11:20 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

Could be a couple of things. The previous poster is correct, if you have a single, smallish gauge green wire, try grounding it (connect it to one of the black wires) and see if the PS latches on. ...
02-14-2009, 07:51 AM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

Decreasing voltage is easy, you just bleed it off in some form or another, usually heat, and you're there. Increasing voltage, especially if you require higher voltage and significant current...
02-08-2009, 07:36 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

Look for a smaller gauge green or gray wire. If you can see the PC board clearly, it usually terminates onto the board by itself, apart from any of the other wires, and sometimes you can see the...
02-08-2009, 01:56 AM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

For starters, I'd remove one of the 10 ohm resistors. By connecting two in parallel, you've reduced the load they are placing to just 5 ohms. And it looks like you are grounding the gray wire...
01-06-2009, 12:32 PM
Replies: 411
Views: 152,457
Posted By dmccormick001

RE: How to convert an ATX power supply to rc use

chadr:

I notice that you haven't gotten any response yet from either of the experts lurking around here, so I'll take a shot at helping you. I've converted about 2 dozen supplies in the last...
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