On 2/11/06, Sean Schouten wrote: > > I am overlooking something. > It seems that I was overlooking something that I haven't seen in the basic opamp material I have had at school. Thanks for that, the picture just became more clear to me. As for the use of a simple RC-filter; Say I would use a simple RC filter, then pass the signal trough an opamp to add some gain to the story, would the amplified output have a constant peak-to-peak value throughout the frequency range? Sean. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist