Hi Ken,

Saw your post in abse, thanks for the info.

I'm not sure whether I'll use the shmitt trigger based solution, or
the ring oscillator you posted. Since I need a relatively small
frequency variation, I'll probably go with the one that gives the
smaller frequency excursion.

Thanks to all who participated in the discussion, I learned alot and
appreciated all the suggestions!

Regards,

A




X1
+5V---O
--------
GND--O !
Y1 .X0 !
GND----O . !
----/\/\--------+---!!----+
VC------O !
.Y0 !
.---------------------------


Something like this is what I have in mind. The CD4053 has some problems