AW: Pulse division

[Niklas Lindberg]

On  7 Oct , R.Fahl wrote:
> I failed to mention one thing:  I'd want simultaneous outputs, from say,
> 2-8.  Serge has a module that does this.
> 
> I've been looking at the CD4018 in the databook.  Maybe there's a way to
> multiplex it.
> 

Here's a straightforward solution, even though I don't think it's
the most elegant one :)

Use an ordinary binary counter and tap of d0 (f/2), d1 (f/4) and
d2 (f/8).

To get f/3 use another counter and decode the output so as to get
a preload load signal when the counter reaches 10B. Wire the
preload to 0000B. Now tap of d0 or d1. This will give you
f/3 with 33% PW (unfortunately :(

If you let this signal clock a flip-flop set to change state
every clock pulse, you will get f/6 with 50% PW.

To get f/5 use another counter in the same manner as above, but
let it start over at 101B. Tap of d1 and you have
f/5 with 40% PW.

Finally to get f/7 use yet another counter set up to start
over at 110B. Tap of d2 and you have f/7 with 43% PW.

There will naturally have to be some analog circuitry after
the counters to give the right impedance & enough drive :)

I feel there's too much components here, IMHO...

Anyway, just my 0.02 :)

/ Niklas