Divider Question

[Don Tillman]

   Date: Wed, 29 May 1996 18:27:37 -0700
   From: Tom May <ftom at netcom.com>

   gstopp at fibermux.com says:

   >You can do this with discrete flip-flops and XOR gates, which can be 
   >arranged to provide 50/50 symmetry waves for division by any 
   >whole-number integer. 

   As in using the XOR with one input connected to the input square wave
   and the other connected to an RC delayed version of the same wave to
   produce pulses on both the negative on positive edges of the input?

There are at least several dozen and possibly even a hundred different
ways to implement a 50/50 divide-by-odd-number counter.  Magazines
like Electronic Design or EDN would have one in their "Ideas for
Design" section almost every other issue during the 70's.

The XOR pulse generator is fine though only slightly inelegant cuz of
the time constant.  OR-gating the clock, clocking one flop on the
negative slope, setting a flop gated on the clock, and variations
galore, are all fine ways.

(I'm sorry Gene, but the EPROM idea is just plain warped.  Yeah, it's
inexpensive, but jeeze....)

I think it would be best for the original poster (Christpher List?) to
scribble out a bunch of ideas and consider the good and bad points of
each.  The problem is really quite easy, and an attempt to solve it is
guaranteed to be a very educational experience.

  -- Don