Thread: Modifying car psu to get 12V

Hello mates!

As this is my first post on this forum, i wanna to introduce myself a bit:
My name is Stefan, i'm living in Germany in a small town near Munich (Oktoberfest, you know ). I'm still a student, driving a 60hp Renault Clio

So now the question:

I'm searching for a good method to get stable and "high-current" 12V in my car (sick of using 10³² 7812 ). So I remembered my old car psu for my notebook, which delivers up tp 6A on voltages between 15 and 24. As this psu is a switching psu, I wondered if it could be manipulated on giving just 12V.

The problem is, I dont know much about switching psu's, but someone on this forum does, perhaps!

Today I opened the psu#s case in order to do some tests on it. The results aren't that good. Everytime the U_in is higher that U_out, U_in will be available at the output and cannot be regulated anymore.

The PMW ic is a "UC3843A", perhaps this helps a bit. psu is a "Vanson SDR-120W"...

So please gimme some advice, I need it really

cheers Stefan