I tried building a power supply using linear regulators and it worked ok, but had problems with the +12 even using low dropout regulators.. so, I'm still testing, but I took a small amp (broken amp, blown outputs stage) but good power supply, it has +/- 20V rails and is pretty clean I'd like to get it down to +/- 12 by playing with the transformer but if not I can keep the regulators I'm using, this works great and even gives you a remote turn on lead to power on the computer.