Started quoting the IC's down here in Brazil. The TL494 and UC3843 are SO cheap! I'm glad to see there's a easy and affortable solution for my case.
The TL494 is cheapper, but the cost of UC3834 is not an issue at all
I think I'll go with bbalazs desing just because it looks simplier than evan's one.
Any special recomendation about that coil or can it be any PSU coil, bbalazs? I got a LOT of broken PSUs that I can savage for the coil or any other component needed. What's the other IC close to the 7812? I think it's the handwriten one in the schematic and it's kinda hard to read. The old printed value is BD246C. So I guess it's a transistor, but can't read the codes.
I think I'll need you guys to help me with tracking the 12v rail and the cut point in the PW60 itself. Just tooka quick look and couldn't find the switch IC. I'll look better and if still can't find it, I'll post some hi-res pics for you.
Forgive me for this much questions, but I'm really bad with analog desing (more the digital design dude myself)
Thanks a lot for the info and glad to see that there is good and competent people like you guys around!