Search: Posts Made By: bgosselin
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08-01-2012, 09:14 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Not sure about your specific charger, but many have a built-in voltmeter that will show you the voltage of the power supply feeding it. If so, you don't really need one on the supply itself unless...
07-03-2012, 08:04 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Yeah, that's possible too. Either way, I wasn't trying to pick on Red or anything, just trying to prevent SirNoob from doing something incorrectly. Hopefully, he reposts the actual value. What a...
07-03-2012, 06:38 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

That was probably a typo (?), but hooking all four 1ohm resistors in parallel will equate to 0.25ohm, which will draw 20A from the 5v line and generate 100w.

Personally, I'd start by putting...
04-11-2012, 05:35 AM
Replies: 411
Views: 152,514
Posted By bgosselin

04-09-2012, 06:35 PM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Thanks for the pics. Couple points I want to mention though:

1) The two heatsinks doesn't necessarily mean two rails. Actually usually one heatsink is for the AC mains side switching section...
04-09-2012, 12:19 PM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Ready for a bit of math?

Charging a 5s pack at 7A requires up to 147w of power (4.2v/cell * 5cells * 7amps). Since the charger is not 100% efficient (typically around 80%), add in another 20% of...
04-09-2012, 07:05 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

You're charging what size pack at 7A? 2s, 3s, 6s, 8s? Because if you are charging a 6s pack @ 7A, that's around 16A being drawn from the PS. It still should be able to handle that though.
04-05-2012, 07:15 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

What are the current ratings for each of the 12v rails? Odd that it says two rails, but there are 3 wire labels (A, B, C). Anyway, try hooking the charger to just one of the 12v wire sets by itself,...
04-05-2012, 05:45 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

That is rather odd. You said this is a thermaltake 500w PS, but does it have a single 12v rail or multiple 12v rails? One of my converted PS units had two 12v rails, and when I paralleled them, they...
04-04-2012, 09:13 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

I've had a couple supplies with a separate sense wire (old Antec true-power IIRC) for each rail. The pot trick does work if the 12v line has the pot, but seems to be hit or miss if only the other...
04-04-2012, 06:04 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Honestly, today's PCs put wayyy more stress on the 12v line than any of the others, so you'd think designers would put the feedback/regulation circuit on that rail instead of the less-used 5v line. I...
04-03-2012, 11:36 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

You usually need to draw at least 1A or more on the 5v line to do any good. So, just parallel another one of those 10Ω resistors, which will bring total resistance down to 5Ω, which will draw 1A. The...
01-07-2012, 09:47 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

That won't work. LEDs are rated for ~25mA, but you have to add a resistor to limit that current. If you hooked a resistor (or two) to a 6v supply, the current would theoretically be infinite: current...
01-06-2012, 07:17 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Oh, in that case, just use a 12ohm resistor. 6v/12 ohm=500mA. Be aware that is going to dissipate 3W, so choose the appropriate resistor power value.
01-05-2012, 04:27 PM
Replies: 411
Views: 152,514
Posted By bgosselin

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

I'm not sure what you want to do with the LEDs, but they by themselves will not limit current.

Voltmeter are one of two types: Hall-Effect or shunt driven.

The Hall-Effect devices are...
01-04-2012, 01:53 PM
Replies: 411
Views: 152,514
Posted By bgosselin

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

To your illuminated switch question:

First, where is this switch located? Is it "interrupting" the main 120v AC line, or is it attached to the green wire? If attached to the mains wires, the...
01-04-2012, 07:13 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Wow, I'm surprised the resistors lasted. You must not have run it very long.

5v @ 0.5ohm (two 1 ohm resistors in parallel) is generating 50w, which is 25w per resistor. Putting the resistors in...
05-20-2011, 10:57 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

What's nice about those gaming power supplies is that they are meant for 12v only (maybe an extra power line too, but it's much smaller) so there's fewer wires to deal with and smaller form factor....
04-29-2011, 02:41 PM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Andrew, I've only had the opportunity to do one PS the way I described, and yes, it did work as I said. For the other two, I did different things (one had an adjustment pot, the other had a separate...
04-29-2011, 08:14 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

Tom: Yes, you definitely hook up the charger to the supply, THEN turn on the supply.<div>
</div><div>If the supply is on and then you hook up the charger, the inrush currents from the charger's...
04-29-2011, 08:08 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

bpenner697, The diagram I posted is for a supply where there is a feedback line specifically for the 12v rail. This is where you would use the diodes and resistor. Only a few supplies have a system...
04-25-2011, 11:38 AM
Replies: 411
Views: 152,514
Posted By bgosselin

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

1: Loading the 5v line usually just makes the 12v line more stable, but doesn't do a whole lot to increase the voltage. Drawing at least 1A on the 5v line helps a lot for stability. Depending on the...
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