gEDA-user: challenge board ALMOST works

[DJ Delorie]

Werner Hoch <werner.ho at gmx.de> 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?  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).