Thread: Diy 400w Psu

96CalibraYE
yes you right!
it works 8-16 Volts at input.
MatrixPC
almera
So, - i build and develop not for one month , but since february of 2006.
this thread created about 1 month ago I just want to know is somebody build a psu more than 300W or no - thanks to all . And i really saw some projects, but threads die (upper links) ........ but this is very nice projects.


I think it's will be commercial project , because it's very difficult to build it by yourself - optocoupler based feedback , 3 transformers , 3 pwms , logic ...... - all this need be tuned. To tune it - needs osciloscope, multimeter , frequencymeter and FREQUENCY RESPONSE ANALYZER( to stabilize feedback loops, this device costs very very high! - look at http://ridleyengineering.com/analyzer.htm -one of this devices .... and look at price ) ........
so .......
I think pics will be at next week or eralier

And i saw on one russian forum http://forum.mp3car.ru/ and you can find some free version of 200w psu ( not mine development) - there are no any over/under current/voltage protections( so it's dangerous) and controller , but it's work, if i'll find that thread - i'll give you some links

ok - found some schematic, don't know author.
http://img81.imageshack.us/img81/5582/compcar2dw2.gif
200W
3.3 v,12v not stabilized , like in cheap psu - for not powerfull system is a good choice i think. But not pointed parameters of transformer but you can calculate this with some free special programs

p.s. oh - I found some mistake - C9 needs to change polarity

babelfish is your friend.

nicksmurf111
Thanks
Wow it's a good idea to rebuild standard atx power supply, but rewinding of it's high-voltage transformer isn't a good way, more powerfull way is to replace psu's transformer by diy thoroidal transformer, and add fets and fets driver to drive this transformer. 5Vsb may be produсed by using lm7805 ic. But this psu will not be isolated,but it's work- some guys rebuild standard atx psu - build based on it supply, but it was only 150W

I'd have to study how they have the hibernate and the pushbutton switch work (the smarts of the new PSU).

so about logic - it's very simply - pic or avr controller based, program inside of controller drives PSU, provides logic of work and one of most ports of controller drives optocoupler to "push the on button" - there is optotransistor inside optocoupler , which shorts contacts on motherboard hibernate is windows function - reaction on "push button"

Maddominican
You not alone- my russian isn't so good too

Here is a pics !!! So, i put it in standart atx psu case.