Ok just finish building the power supply, I had to make a new PCB but this project has taught me a lot. so I didnt mind. I use the TL081 but use a LM7809 to drop the voltage down, use a 30V 3Amp transformer and the Power supply outputs 25 volts which isnt bad :D Thanks for all the inputs into this thread it help to better my design :) Here's a couple of photos. [img width=680 height=510] [img width=680 height=510] No room left for the amp meter to be install inside the case, so stuck it on the side :D