Download "Tandy's Little Wonder". In the tech section there are instructions on how to use a PC power supply. That has all the tap-in connections for 12V, 5V, and -12V (might be -5V.... I forget!!). sparksandflames.com/files/TandysLittleWonder-2nded.pdf Frank Swygert Fix-It-Frank Handyman Service 803-604-6548