Bob, thanks for sharing that, did you notice that all the marginal resonators were physically smaller than the ones that did work ? You listed them basically in order of increasing pad pitch. Maybe there is a pattern here, related to the available oscillator gain in a PIC ? Did you try to test at reduced Vdd too ? thanks, Peter P. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist