Thread: advice on homemade psu

hi all.

im currently doing a worklog called project tightwad - because i want to try to install a laptop into my car without spending any cash and using existing parts i have in my garage.
so the first thing - i have a sony laptop, which i thought was 12v...great! until i realised i had the wrong power brick in my hand
as it turns out, the sony is 19.5v input.....so what i wanted to do was see if i could make a 12v-19.5v psu....out of bits i already have.
could anyone with tech knowledge please provide me with a simple diagram of what i would need to make the psu?
i know its quite a lot to ask, and there are psus on the market relatively cheap, thats not the issue...i WANT to do everything i can myself.
im sure that all the components i need will be in kit i have too, or i may be able to frankenstein one from something....just i dont know where to start


so...please if anyone has the time, i would be massively thankful, and of course you get full recognition in worklogs etc for the input/help

regards