Great, thanks for the schematic I can visually see the problem now. The thought of getting 22v variable sort of took over when I spotted this pc Atx mod on other sites. But when I think of it, I probably wouldnt have needed that voltage much in the real world. The -12v , & in fact all other - rails have now been snipped off the psu, to be gone for ever. So I am now happy with 1.2v to 10v with a real 0v. I will go with +12v and + 5v on the other binding posts. It was so kind of you to put some time into this, to avoid me having any further problems down the road. Best Regards.