[sdiy] divided and synced clock for BBD?

[David Moylan]

I've got an idea that I'd like to proto up as a companion to the Blacet
Time machine, but which would also be useful for other delay effects or
things with high speed clocks.  This is basically to replicate the
'Clix' funcionality of the original Electro Harmonix 16 second delay (as
I understand it).

Basically the idea is to have two 12 bit counters (I'm thinking CD4040)
both clocked by the HF clock in the delay.  Counter A counts up to the
complete number of clock cycles it takes to get through the delay line.
 For the TM there are 4096 stages (need to clarify whether that means
4096 or 2048 clock cycles).  The output of this counter can be used to
blink an LED at the delay speed but more importantly resets (syncs)
counter B.  The output of counter B goes through the DAC then a
comparator with a panel set threshold which will also reset counter B.

The output of the comparator will be a divided down clock pulse with X
number of pulses per BBD delay time and which will change speed with any
changes to the delay time, but the number of pulses per each echo will
remain constant.  Not all panel threshold settings will get you a
perfectly even spacing, but that's not a limitation to me.  These pulses
can be used to clock a sequencer and the sequencer and delay will stay
locked.

As I think about it now, being able to set the counter / comparator to
low counts might not be that useful since I don't have many uses in my
modular for a very high speed clock, so maybe I can just ignore the
lower 4 (or more) bits and use a R/2R ladder.

Thoughts?

Dave