ph-500atx 400w psu rebuild help

[shovenose]

picture here: i own the pic so i can link to it

oem?
amp capabilities?
improvements?
fan control (loud 120mm)?
more pics:

http://psurepair.freeforums.org/down...d=20&mode=view
http://psurepair.freeforums.org/down...d=21&mode=view
http://psurepair.freeforums.org/down...d=22&mode=view
btw the date is wrong

[370forlife]

Re: ph-500atx 400w psu rebuild help

YueLin YLP-013. Actually kind of a capable platform that can do 350W (in spec) if D13009L primary switchers are used, or about 400W (in spec) if 2sc3320's are used. Also depends on whats used on the secondary.

[c_hegge]

Re: ph-500atx 400w psu rebuild help

I agree with 370 It looks pretty good. All it needs is some input filtering, which isn't hard to scavenge from a dead PSU.

[shovenose]

Re: ph-500atx 400w psu rebuild help

can i use those brown things that say 105k 250v on them? (like those yellow square caps but in brown and rounded

[c_hegge]

Re: ph-500atx 400w psu rebuild help

It would probably work, but I don't think it would be as good as a proper X-cap. That's what I think anyhow, but wait for someone with more experience than me like 370forlife or everell to chime in.

[kc8adu]

Re: ph-500atx 400w psu rebuild help

x and y caps need to be rated as such.
they will be covered in regulatory agency logo's and ratings.
if you are going to add the missing parts to these junkers do it right.

[shovenose]

Re: ph-500atx 400w psu rebuild help

What do x and y caps do and how do they get their name. Why not abc123 caps? Do they need to be put in in a specific orientation?

[shovenose]

Re: ph-500atx 400w psu rebuild help

Also: can i just stick a thermistor in series with the fan connector? Or will that not work right?

[Th3_uN1Qu3]

Re: ph-500atx 400w psu rebuild help

You'll need a little transistor circuit to "read" the thermistor afaik. Those little thermistors aren't designed to have too much current flowing thru them. But if you got extras try it anyway, if it goes up in smoke you'll know it was too small.

[goodpsusearch]

Re: ph-500atx 400w psu rebuild help

Some cheap psu makers do that. As a result the thermistor is hotter than the heatsink itself!

[shovenose]

Re: ph-500atx 400w psu rebuild help

i only have two so thats a no-no. i can kust rip the temp control circuitry out of an old antec

[c_hegge]

Re: ph-500atx 400w psu rebuild help

Yup, you could scavenge one from another PSU, or you could make one of these: http://www.heatsink-guide.com/control.gif

[shovenose]

Re: ph-500atx 400w psu rebuild help

but i dont have those parts...i want to use 100% free salvaged parts . this is a Learing experience not a Spend money experience

[shovenose]

Re: ph-500atx 400w psu rebuild help

can i just put a resistor ino the fan circuit? no temp control, itll just slow the fan. and i found some filter components out of a 124w delta psu...

[370forlife]

Re: ph-500atx 400w psu rebuild help

I have a schematic somewhere around here of the little fan controller boards they put in the CWT built antec's. They use parts you can find in almost any psu. I think the hardest to find parts are the TL431 (any psu is littered with these,) a A1020, and some various resistors.

[shovenose]

Re: ph-500atx 400w psu rebuild help

where can i find that schematic?

[370forlife]

Re: ph-500atx 400w psu rebuild help

I drew it up on the back of some sticky note or something. I can't find it right now, I'll have to draw another one up.

[goodpsusearch]

Re: ph-500atx 400w psu rebuild help

Here is another fan control circuit:


And here is something that just regulates the voltage into some value lower than the original (maybe one could put a thermistor in series with the fixed resistor?)

[shovenose]

Re: ph-500atx 400w psu rebuild help

the second one looks easy. but isnt that the same as simply putting a resistor in series wit the fan?

[Th3_uN1Qu3]

Re: ph-500atx 400w psu rebuild help

the second one looks easy. but isnt that the same as simply putting a resistor in series wit the fan?

In this case, yes.