PDA

View Full Version : Generic PSU +5V mod


Micutzu
07-27-2002, 06:12 AM
I have here a mod to raise and stabilize the +5V line for any PSU , but works best with generic ones , wich have a worse stabilization . It will work also with high-quality ones , but the results won't be so noticeable .
The idea is that usually the +12V is not so used and has a pretty large reserve of power , from wich the +5V can take some . In fact , this is a simple voltage stabilizer and is pretty easy to build .

Here are the things you need :

T - Transistor - 2N3772 - it basically has to admit at least 25Amps , 30V and over 120-130W .
IC - LM7805 - integrated 5V stabilizer
D - 1N4148 diode
C - 100u 16V capacitor
Large heatsink for T since it will get very hot .
Thick wires (2mm) to connect this to the PSU .

You just connect the +12V to the yellow wire of the PSU , +5V to the red one and GND to the black ones .

If you need more details just PM me or e-mail at micutzu20@hotmail.com . The 5V can also be adjusted .
DDTUNG
07-27-2002, 03:29 PM
Thanks for the info.:)

DDTUNG:cool:
Marci
08-08-2002, 11:23 AM
nice one dude... now where's my compnents catalog??
Sayajin
08-09-2002, 04:23 AM
anyone tested this yet????
Micutzu
08-10-2002, 11:46 AM
Me . It works , but as i said , the T transistor gets very hot , so you need a good (large) heatsink .
FrzzMan
08-26-2002, 04:44 AM
Look at this

http://www.overclockers.com/tips991/

I'm wondering is there any different between two ways to mod the +5v mod... Is that Micutzu20's can handle higher current?

It said that each 7805 can handle 1A of +5v out... so can it be connect directly to main +5v line?

Plus, do you have any pic of those components, it will help me easier to find them.

I have two KA7805 here... wondering is there any different from LM7805... gonna try it with my multimeter...
Micutzu
08-31-2002, 03:12 AM
Yes , mine can handle higher current . Since the 5V line is rated at 25A at least on the 300W PSU , the 2A added by those 2x7805 is insignifiant . The transistor can bring all the current that is not needed from the 12V line , wich is at least 7-8A . Sorry i don't have any pics . I actually used a KD607 transistor , russian made i believe , wich is rated at 25A as far as i know . And the KA7805 is the same thing with LM7805 .