[sdiy] Revamped analog shift register works

[David G. Dixon]

Well, my reworked version of Ken Stone's analog shift register with LF444
and DG409s seems to work pretty well.  The caps hold the samples, no
problem, even though I didn't use guard traces.  That all seems to be a bit
of a non-issue.

However, there seems to be some issues with the clock circuit, which I
didn't alter.  For one thing, a sine or triangle doesn't trigger it,
although it should in principle, since its just a comparator.  It seems to
require a rising edge.  My keyboard gate and trigger signals trigger.  A
pulse wave also triggers it, but when the circuit is clocked with my LFO
pulse wave, the voltage levels fluctuate randomly -- not a lot, but
definitely enough to notice.  If I retrigger it by pressing a single key on
the keyboard over and over, the voltages remain rock steady.  This is all a
bit puzzling.  I won't be able to do anything about it until I return from
France next week, but if anyone has any insights, or has encountered similar
problems, I'd love to hear about it, especially if you have a fix.