David VanHorn wrote: > They do mention how to check the oscillation margin, and drive level, > which pretty much covers that. That's not what I was talking about. The impedence of the driver output directly effects the choice of capacitor values, but I don't see that discussed or included in the equations anywhere. ****************************************************************** Embed Inc, Littleton Massachusetts, (978) 742-9014. #1 PIC consultant in 2004 program year. http://www.embedinc.com/products -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist