I have built a few LC oscillators (VFOs) using a single gate of a
74HC04. Yes I know the 'HCU-4 should give less trouble, but I didn't
have any at the time. For an example, see

http://www.arsqrp.com/ars/images/bac...mages/Vfo1.gif

It should be possible to insert a crystal somewhere in the feedback
path to get a single-inverter crystal oscillator, though I have not
tried it. The key is that the tuned circuit is used to provide an
extra 180 degree phase shift.

Steve VE3SMA


PaoloC wrote in message ...
Hi,
thanks to all those who replied and discussed this topic, providing me
with a lot of good suggestions.