[sdiy] PLL module

[David G. Dixon]

> I designed this PLL circuit for audio to track a FatMan VCO and produce
> 1F, 1.5F, 2F, 3F,
> 4F, 6F and 12F outputs.  Lag time is adjustable and can be made quite
> insignificant at
> the low end.
> 
> http://home1.gte.net/res0658s/fatman/4046pll.html

That's a cool idea!  I was going to build an octave divider, but this seems
much more useful.  I love this list!

I'm also working my way toward a saw animator "inspired" by Mark Barton's
description of Cynthia's unit on her website.  For that, I was thinking of
using Harry Bissell's (very cool) EFM pitch follower circuit, perhaps with
one or two little changes.  I suppose it wouldn't be a big deal to adapt
that circuit to this application?  The selling point would be that the lag
of that circuit is exactly two periods of the incoming wave, irrespective of
the frequency (and this can actually be reduced to one period if you're
clever (I think)).