The power supply is a Artesyn POL, with plenty of decoupling. Thats my first thought...power supply....so I made sure it was in range to start with, haven't looked at noise yet...but maybe I will run that board with the good one's supply (jumper over) and see if that makes a difference. Richard Prosser wrote:How much decoupling do you have on the board and have you checked that the voltage regulator is not going unstable? It sounds a lot like a power supply problem of some sort to me. Richard P On 20/10/05, Robert Young wrote: > You mention a resitive divider. What is the total impedance seen by the PIC > due to the divider? Can you booger in a buffer op-amp just for testing the > "bad" client board? > > > > Rob > > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --------------------------------- Yahoo! Music Unlimited - Access over 1 million songs. Try it free. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist