On April 6, 2005 06:23 pm, Paul Gaastra wrote: > I am trying to design a dual rail power supply for a photo diode > detector. Sounds like 1 power supply too many. Have you thought of redesigning your circuit to only use 1 power supply? You may see abundant examples on the internet where an opamp circuit uses just +5v. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist