Re: Need a replacement power supply with -5VDC
It might be easier to just add your own -5v rail to a power supply you already have.
Something like the MC34063 could be used to take some of that excess +5v and invert it to -5v. Only takes a handful of extra parts, and the datasheet has all the equations you need to figure out all the component values.
Alternatively, if the board just needs -5v present to POST, and not for anything else, you could take a PSU with a -12v rail (which is still most, I believe) and use a 7905 to linear regulate that down (or up?) to -5v. Not as efficient, nor as "fun" in a EE sense, but cheaper and easier than the 34063 by far.
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Re: Need a replacement power supply with -5VDC
Well, OK. I'll be darned. No other motherboard in the world without ISA slots requires a -5V rail. (
to ASUS for that one).
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Re: Need a replacement power supply with -5VDC
Yes, I meant ASUS P4C800-E Deluxe, forgot to double check before I posted.
The P4C800-E may not have ISA slots but it requires a PSU with -5V as this has been mentioned by others who tried to use a PSU without -5VDC and the system just wouldn't even post.
http://www.c-amie.co.uk/technical/ps...010-intel-478/Leave a comment:
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Re: Need a replacement power supply with -5VDC
That board (P4C800-E) does not have ISA slots, so no, you do not need -5V. Any PSU will be fine.
EDIT: I probably could add that it would probably be best NOT to use a PSU with a -5V rail, simply because those that do have it usually have most of the current available on the +5V rail, while that board has the CPU powered by the +12V rail. Power supplies that have a decent amount of current on the +12V rail, rarely have a -5V rail.Last edited by c_hegge; 09-15-2014, 03:05 AM.Leave a comment:
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Re: Need a replacement power supply with -5VDC
Never heard of a Asus P4C400-E, did you mean Asus P4C800-E?
As for the power supply, I have several that would work for you (has the -5vdc). I would be willing to sell you one just send me a PM (private message) on your price range and I will send you a list.Leave a comment:
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Need a replacement power supply with -5VDC
I am in need of a replacement power supply with -5VDC which seems to be needed for the ASUS P4C400-E motherboard as mentioned by others on the internet, anyone know a good way to find one as I have tried Best Buy and they all do not have the -5VDC. Thanks!
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One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
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Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
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Assuming... -
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