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PSU- getting clean 12v output for hobby use?

post #1 of 3
Thread Starter 
Hey guys,

I have an old psu I have been using about 2yrs to power chargers for hobby grade batteries (rc cars) without issues but I recently just read a small load needs to be placed on the 5v bus to get stable power on the 12v side, does that make any sense? My OLD psu is rated for 18A and the largest load I have placed on it was i think 8A continuously for about 1hr at a time. Is there any truth to that statement?

Also some chargers now a days can charge several batteries at a time, If a psu is rated for 30A on the 12v bus, what would be the max amps I should use? I would be putting all the 12v wires on 2 pins so the wires dont get hot.
Quote:
Here is the source I read that on
http://www.tjinguytech.com/my-projects/convert-pc-ps

"Next came the load resistor. I knew I needed about a 1A load on the 5V bus in order to stabilize the 12V bus, and that more was better. I ended up using 2x 1.5ohm 10W in series to create a 3ohm resistor that would draw 5/3A. I made the connections and attached the resistor to the case to keep it out of the way. "
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post #2 of 3
Depends on the power supply design.

For many cheaper units, so long as it seems to turn and stay on and operate, having no +5V or +3.3V load just means that the +12V rail is just going to droop down because of the way the group voltage regulation is designed. If 11.5V or whatever output is fine, then it should be okay.

Some designs do really go bonkers with no loads on some rails, I think.
post #3 of 3
Thread Starter 
Quote:
Originally Posted by mikeaj View Post

Depends on the power supply design.
For many cheaper units, so long as it seems to turn and stay on and operate, having no +5V or +3.3V load just means that the +12V rail is just going to droop down because of the way the group voltage regulation is designed. If 11.5V or whatever output is fine, then it should be okay.
Some designs do really go bonkers with no loads on some rails, I think.

Ah OK, yeah max voltage output is only 8.5v anyways. The charger I use should have a low voltage alarm since its a pricey unit, luckily I have had no issues. Out of curiosity I think i will test power with my meter next time I charge a battery.
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