Sean Breheny cornell.edu> writes: > You can get specifically "unbuffered" versions - like the 74HCU04 or the > 4009UB. These usually work reliably in a negative feedback connection. Indeed using a 74HCU04 would solve the problem but 74HCT4060 is not the U kind. The parts I tried were from NXP and another make I forget, also name brand. =20 > I looked up the CD4060 you mentioned but I think the part number must be > wrong because the 4060 appears to be a ripple counter. 4060 is a ripple counter with built in oscillator gate. Try HEF4060UB for a datasheet. CD4060 is another part number, and MC14060 another. They should be the same. > I think also that you and Tom may be mixing up different types of > oscillators. For the typical Pierce crystal oscillator circuit, you do NO= T > want Schmitt trigger behavior. ST would be for relaxation-type oscillator= s > using an RC circuit. It is possible that in desperation, one can get a Pierce oscillator working= , by building a 2-inverter Schmitt oscillator using the 2 inverters in the HCT4060 oscillator section and by coupling the Pierce mode xtal circuit to one of the gates. I really do not want to go there heh. -- Peter --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .