Search: Posts Made By: Andrew
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03-26-2013, 04:47 AM
Replies: 411
Views: 152,508
Posted By Andrew

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

I have done this and successfully run the combination at 24v. I DO NOT recommend it - having two supplies from close production dates and of the same model and make improve your chances, but...
08-01-2012, 01:15 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

Nothing to add on wiring in your meters - bgosselin's diagrams are spot on.

Make sure your voltmeter is classified as DC. Some ampmeters are listed as AC or DC; some as DC only. Also ensure...
07-03-2012, 09:23 AM
07-03-2012, 07:09 AM
Replies: 411
Views: 152,508
Posted By Andrew

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

Even though he stated that his resistors were 1 ohm, it's possible that he intended to write 10 ohms. At 4s, I would think that a 4 ohm load would have been sufficient to hold his 12v rail above...
04-10-2012, 11:45 AM
Replies: 411
Views: 152,508
Posted By Andrew

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

No, what you have done is fine. With only a 3.3v sense wire, that eliminates one part of the puzzle.

It would really be useful if you would try a charge cycle on your 5s cell starting around...
04-09-2012, 07:49 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

I agree WRT to the three 12v outputs.

I think he meant orange/brown for his 3.3v to sense wire connection.

On your motherboard connector, do you have any pins other than orange that have...
04-09-2012, 12:50 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

And it gets worse! Your current demands appear to be loading the supply causing a voltage sag which in turn increases the current load. Using bgosselin's calculations of 211 watts, by the time your...
04-08-2012, 05:13 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

Does your charger stop after the charge cycle begins or some time after. What charge rate are you using? You might try backing off on the rate and see what happens.
04-05-2012, 08:29 AM
Replies: 411
Views: 152,508
Posted By Andrew

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

What is the model number of your PSU? Is there any way you could get us a good picture of the specification placard.

Thermaltake manufactures a pretty decent supply, and at 500W, you should be...
04-04-2012, 07:35 AM
Replies: 411
Views: 152,508
Posted By Andrew

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

With the ATX12v2 standard and later PCIx demands, the 12v rail is certainly carrying a lion's share of the load, but until there is an industry wide shift in power management architecture, I don't...
04-03-2012, 12:25 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

Agreed.

While many of the newer supplies will latch on without a pre-load, the load resistors significantly improve the supply's performance and reduce voltage drop under load.
04-02-2012, 07:51 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

What value load resistor do you have on the 5v rail?
01-04-2012, 06:32 AM
Replies: 411
Views: 152,508
Posted By Andrew

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

That's correct. There's seldom much advantage in dropping the pre-load below 2 ohms - it simply results in an excessive load on the PSU and high heat (which you found out). By connecting your two...
01-03-2012, 06:14 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

Are they connected in parallel or series. If you're using 1 ohm resistors, they should be connected in series. They will get very hot, but with 12.6 volts on the 12v rail and given the amount of...
04-29-2011, 05:33 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

I'm in complete agreement, the only consistent factor with these supplies is inconsistency in design. I've run across several supplies with internal pots, but have seen only one with multiple sense...
04-29-2011, 12:01 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

Have you metered a supply to see if this is actually the case? In theory, you would expect all voltages to move in the same direction, however, this is not my experience. Rather than deal with...
04-01-2011, 04:57 AM
Replies: 411
Views: 152,508
Posted By Andrew

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

1. It is not correct. The +5VSB (volts standby) will meter +5 volts as long as the supply has AC power, even though the supply does not appear to be running. It's purpose is to keep the NIC...
04-01-2011, 04:17 AM
Replies: 411
Views: 152,508
Posted By Andrew

03-06-2011, 08:55 PM
03-06-2011, 07:03 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

You can pick up an LED from most any electronics shop or on-line. LEDs are polarized which means that the leads must be connected to the correct positive and negative rails. If it is a new LED, the...
02-05-2011, 08:20 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

You're correct - that's just bad information. There would be a lot of happy folks if it were true.



Realistically, many of the less expensive supplies are probably overated - the spec....
02-05-2011, 07:26 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

Using 2 (or more) wires on the same rail to one jack does not effect how the PSU functions. What is does do is ensure that there is a minimal voltage drop and maximum current carrying capacity...
11-11-2010, 05:48 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

Generally, no from touching the case; touching something else may have been the culprit.

However, in one of the photos, the lead from the resistor appeared to be touching the heat sink - that...
11-07-2010, 06:20 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

The Power_ON rail is green and must be connected to ground (black), either directly if you're going to use the AC master switch found on some supplies or thru a switch. Some supplies will latch...
09-23-2010, 10:02 PM
Replies: 411
Views: 152,508
Posted By Andrew

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

Look at the 2x10 or 2x12 motherboard plug - which pins (colors) do the sense wires connect to? Generally, reconnecting the sense wires to the same rails that were on the MoBo connector will solve the...
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