[sdiy] Moog wander

[Ian Fritz]

At 03:24 PM 4/16/06, René Schmitz wrote:
>Its an interesting thought, maybe its bogus but anyway:
>
>If the triggering circuit of your scope or frequency counter or what ever 
>can't be trusted, then why should we trust the reset circuitry within the VCO?

Sure, good point.  I'd say it may not be the circuitry so much as how much 
opportunity there is to get noise on it.  Having the comparitor physically 
close to the ramp and having a locally regulated trip point has to help.

But the brilliance of Kenneth's method is to just eliminate scope 
triggering as an issue. I was amazed at how well it worked, how easy to 
do.  It would definitely be worthwhile to look at how the inherent VCO 
jitter/wander depends on frequency for different designs.