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e-Electric Batteries & Chargers > PC PS with no 5v line resistance?

Bluesilver30
Veteran
Location: USAF Academy, CO - USA

I just made a power supply with an old pc one, and my volt meter is showing that it is at about 11.8 volts. i didnt have any light bulb on hand to give the 5v line resistance, so i decided to go ahead and give it a shot anyway. my charger says that any power supply ranging from 11 to 15 volts will be fine to charge with. so is it needed that i put a load on the 5v line since i have enough power for my charger? i didnt see anyone try this without a 5v load in any of the other posts. thanks.

-Nick

01-02-2004 Over year old.

Silvashadow
Senior Heliman
Location: Bexley, Kent, UK

I found that an ATX PS I modified would work without a load on the 5V rail. Have you put a load on the 12V output and checked the voltage? I think this is becouse it is checking the 3.3V rail. The older AT PS definately needed the load.

If you have access to a 'scope have a look at the 12V output some of these PS's have a high frequency fluctuation between 11.3 and 11.8V. I found this upset my charger.

01-02-2004 Over year old.

Bluesilver30
Veteran
Location: USAF Academy, CO - USA

yup, i checked it while my charger was charging on it. everything is working fine. maybe since i had the power-on wire and a neutral wire hooked up to turn the PS on, i didnt have to put a load on the 5v line? the output is a constant 11.8.

-Nick

01-02-2004 Over year old.

edmund
Senior Heliman
Location: UK

if you load up your 5v wire,you will get higher output,i load up tow of my 5v wire with side light blub from my car and it give me a output of 13.4v hope this help.

01-03-2004 Over year old.

Bluesilver30
Veteran
Location: USAF Academy, CO - USA

that makes sense. though there's no real point for me to do it, since im only charging small hummingbird batteries. 11.8 works fine for me. i left the wires cut and taped just in case tho. thanks for your replys.

-Nick

01-03-2004 Over year old.

white chocolate
Key Veteran
Location: Baltimore, Md.

power supply

Well I just made my own supply and I dont have any load on the 5v. It works on the nova. Havnt had any problems. Is there something I should look for that could be a potential problem in the near future?

01-19-2004 Over year old.

HOMEPAGE

vitek
Key Veteran
Location: Corvallis, OR

FWIW, I built 3 supplies, 1 ATX, and 2 AT.

They all worked fine without a load on the 5V line, provided I didn't try to pull to much current. Quick or Auto charging 12-18 cells with a SuperNova is where I noticed some problems.

The voltage would sit up around 12, then drop down until I got a low voltage indication and the charging stopped. Setting it to charge at a slow rate seemed to work, but it was easy to stick a load on the 5V.

Travis

01-20-2004 Over year old.

Silvashadow
Senior Heliman
Location: Bexley, Kent, UK

Hey All, have you looked at the parellel thread to this one?
http://www.runryder.com/helicopter/t83898p1/

01-20-2004 Over year old.

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e-Electric Batteries & Chargers > PC PS with no 5v line resistance?

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