On Wed, Mar 9, 2011 at 1:37 PM, N. T. wrote: > The concept of filtering a system's output is completely different to > the concept of regulating a system's parameter to make the output meet > some criteria. > > Some would say these are the same concepts, but I say they are different. You're right, but in this case, all I want is a clean signal without any DC offset, so a high pass filter after the first stage will do nicely. I was more worried about the capacitor arrangement in all of this. I'll probably use two tantalums back to back --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .