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Re: A163 as a clock divider

2002-11-11 by Tim Stinchcombe

Hi Joe,
I had an idea that nearly worked with respect to this:

> thinking. The A163 doesn't have a reset input like the A160 clock 
> divider does. Won't it end up in an indeterminate state when you 
reset 
> the master clock? That would mean the clock pulses from the A163 
could 
> be as much as 180 degrees out of phase with the master clock, a 
> half-step delay.
> 
> Has anyone tried this? Is there any way to do what I want to do?

The idea was to hold the 163 at 'divide by 1' whilst in a 'reset' 
state, then let it jump back to the required 'divide by n' when the 
reset is removed (and which by assumption also re-starts the main 
clock). Hopefully this means it starts dividing again from the right 
point. I did this by switching the CV controlling the 'divide by n' 
through a 150, with the other side at ground, and set the 163 so that 
the ground input gave 'divide by 1'. The 'reset' then controls the 
150. The 'fly in the ointment' turned out to be a couple of 
capacitors having a smoothing effect on the CV input to the 163, so 
it cannot see instaneous jumps in CV - it quickly ramps 
through 'divide by 2', 'divide by 3' etc. to eventually get 
to 'divide by n'. I'm assuming the caps are there for stability 
purposes - whether they could be reduced sufficiently to allow this 
idea to work (it may not even be a very good one at that!) and still 
be stable, I don't know, I'll think some more on it...

Tim

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