[sdiy] Help with oscillator

[Tim Stinchcombe]

> > Does this circuit, a Pierce oscillator, really work with Schmitt 
> > triggers?
> >   
> Apparently Tim R. found out that it *can* work. But he also found out 
> that it does not work reliably. In some units the oscillator 
> won't start 
> or stay in relaxation mode (the 4 kHz oscillation).

Ha! I didn't even see that: but now you mention it, simply calculating
1/(RC) with R=10meg, C=18p, gives 5.5k - i.e. this seems *to be* the 4kHz
oscillation!?

> Better 
> change the gate to a non-Schmitt trigger type.

I concur!

Tim
__________________________________________________________
Tim Stinchcombe 

Cheltenham, Glos, UK
email: tim102 at tstinchcombe.freeserve.co.uk
www.timstinchcombe.co.uk