> May I ask what resonator mfg and their part number? what PIC was used with these resonators? > > thanks. Surface mount version is ECS. Part # ECS-CR2-20.00-B-TR. We use this one on a serial LED module with a 16F690, but I've used them with various others. 18F, 12F, 16F, etc,. 3-pin through-hole versions w/caps are ECS also. Part # ZTT-20.00MX. Never had a problem with any of them. Regards, -Bruce tech@rentron.com Reynolds Electronics -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist