Thread: power supply questions. + Schematic

You can't just tie the outputs of DC-DC switcher circuits together. What happens if one is set to regulate to 5 volts and the other one is set to regulate to 5.01 volts? One turns on, the other turns off. Who let the smoke out?
You either need diodes or inductors.

Thanks Jeff,
This is the kind of info I would like to get.

Whoops..
I got that (output joining) from sproggy, BUT I OVERLOOKED SOME THINGS.

In schematic from sproggy it says you can join the output's but I missed 4 parts. or maybe some diodes

But what do you think of it ?
Could this be a good power supply ?

And what about the other questions I asked ?
Anyone (what the exact procedure is to power a pc, and what happens during this period)

Thanks in advance !

Greetz

my dear friend ... your drawing is so confusing ... im sorry .. but it is ...

Yes, you are absolutely right about this, but once again, I was on holiday, I only had pen and paper and some data-sheets, and I had nothing to do 'cause my girlfriend was study-ing (?!?).
I started somewhere, and while I was busy it grew and grew. I have to mention that this is the first time I drew something like this.
When I got back from holiday I had this schematic just lying around, And I thought I would share it with you all.
BTW. did you print it on a laser-printer ??
because when I print it, it is readable.
If you can't read it, you could also use the datasheets of the components used. I used sample schematics from them.

.....and the PSU goes on full power got it so when u have a PSU like the sproggys design which has all the volts execpt the 5V stby the mobo starts when it receives the power good signal. and does not depend on the Stnd by current....

Thank you for this info.
So, when I put power through the power-supply, (all the voltages get regulated, and delivered to the mb) and the power-good-signal is send to the mb, The computer starts to boot.

I have searched the entire web and found the sproggy designed to be the best for in car entertainment... so i have made few extra just ... check out the sale section of this forum

I already have all the regulators for this supply and some more. (4x max1771, 4x max787, 2x max788, 2x max774 and 2x max775)
I'm absolutely sure this friend of mine can assemble and solder it. (It's his work, but, just like me, he doesn't have any design-experience, so) I just need a good schematic to build.

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In Addition to Jeff Mucha's Post
Q. Which components do I need to tie the voltages to eachother ? I mean, Is there some kind of component I can use at every voltage ? (3,3 5 12)
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A lot off questions for ya all, but I really hope ya all can help me..
hehehe.. something like an open-source-power-supply

That's it for now !
Greetz,

No one ?

Well, I guess it's all up to me then.

I'm going to try this with this friend of mine.. it'll work with some adjustments.

Greetz

Originally posted by Raas:
<STRONG>No one ?

Well, I guess it's all up to me then.

I'm going to try this with this friend of mine.. it'll work with some adjustments.

Greetz</STRONG>

Sproggy used 10 uh inductors to isolate the parts. You could do the same thing.

I think this power supply might be a bit of overkill, no? Unless you plan on powering a tank! =)

There are many people running computers off of the sproggy power supply fine, and I think to get a bit more juice you only need 1 or MAYBE 2 extra power circuits, but I think you've gone a bit overboard.

But please let us know how it all worked out!!