Hi DJ, On Monday 11 September 2006 16:42, DJ Delorie wrote: > Werner Hoch <[EMAIL PROTECTED]> writes: > > When I'm using 7414 as oszillator I usually use the third circuit. > > This only works with IC's that have schmitt-trigger inputs. > > What values (or ratios) of R3 and R2 do you use?
Depends on the frequency and the capacitor ;-). The resistor R2 is only there to improve the symmetry of the output pulse/gap ratio. You can just remove it if you don't need exact symmetry. R2 is usually 10 times larger than R3. > I assume R2 is > large, since it's configured as a voltage divider, but I'm trying to > keep R3 large too to get a low frequency out of such tiny parts > (0.01uF is the largest 01005 they make). Why in hell do you use such damn small parts ;-). regards Werner _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
