Bench PSU Build

[ratdude747]

Re: Bench PSU Build

I'll definitely need your guys' help when I get this project started. Señor Ratdude is going to hook me up with a PSU that has a 1 amp -12v rail.

Yes, I will...

fresh from ratdude's stack of old PSUs is a hipro made dell unit, 250W. He mentioned needing a PSU and i searched the stack and found a winner.

some specs:

dell hp-p2507f3cp
5v 22A
3.3v 18A
5vsb 2A
+12v 14A
-12v 1A
250W
teapo caps

attached pics.

has plenty of space for banana jacks and whatnot...

WLG, good luck on the project! Keep us posted!

[lti]

Re: Bench PSU Build

That is a good power supply. I have the non-PFC version waiting to be recapped.

I would like to see someone build a real bench power supply, like a 0-30V power supply with current limiting.

[Th3_uN1Qu3]

Re: Bench PSU Build

I would like to see someone build a real bench power supply, like a 0-30V power supply with current limiting.

I made one, it was even split, up to +/-60v, but had some issues with the feedback loop (interference). Will probably rebuild it next year.

[lti]

Re: Bench PSU Build

How did you add current limiting?

[Th3_uN1Qu3]

Re: Bench PSU Build

The classic way - a shunt resistor in the positive rail feeding into the second error amp of the TL494.

[weirdlookinguy]

Re: Bench PSU Build

Here is that graphical schematic I was talking about:

http://8675309.dyndns.org/_media/var_psu_graphical.jpg

[momaka]

Re: Bench PSU Build

fresh from ratdude's stack of old PSUs is a hipro made dell unit, 250W. He mentioned needing a PSU and i searched the stack and found a winner.

some specs:

dell hp-p2507f3cp
5v 22A
3.3v 18A
5vsb 2A
+12v 14A
-12v 1A
250W
teapo caps

That's almost exactly (if not exactly) the same PSU I have - see this thread:
https://www.badcaps.net/forum/showpo...&postcount=228
It's a great PSU, I use it to test all sorts of computers - both 5v and 12v heavy. The voltage regulation is always dead-spot on, too. Too nice for a bench PSU, IMO. (although if you do want a reliable bench PSU with stable voltages, there's probably nothing better than this).

[ratdude747]

Re: Bench PSU Build

I have a couple of those somewhere... one has a replacement fan irrc (darn adda fans of doom).

[lti]

Re: Bench PSU Build

The Adda sleeve bearing fan in mine was still full of oil when I opened it, but the fan control thermistor had fallen out of its clip so the fan didn't spin at all. If that didn't happen, I wouldn't have to recap it.

[ratdude747]

Re: Bench PSU Build

the fan spun, it was just giving the evil dead bearing noise.

[weirdlookinguy]

Re: Bench PSU Build

Dying fan is no problem for me btw, I don't trust Adda and I was going to replace it anyway.

[ratdude747]

Re: Bench PSU Build

Dying fan is no problem for me btw, I don't trust Adda and I was going to replace it anyway.

that would be my suggestion.


i was speaking about another psu i have at my old house (I have a bunch of 250W units there still). the unit I will send's fan is in working, non-noisy condition, but you never know... after all, there are few things worse than a psu getting by a bad fan.

[weirdlookinguy]

Re: Bench PSU Build

UCSD throws away so many early 2000's Dells right now that I have a fairly decent supply of 80mm NMB fans