SV: Re: [sdiy] X8 squarewave multiplier.

[harrybissell]

Hiya Karl (et al)


> > The pulse rising/falling edge technique does not work beyond
> >   2X.  You NEED a square wave for it to work.
> 
> Yes it does, a dubble edge detector on a square does 4X!
> Just time the Rc nets properly and it will cover 0 to 20khz
> easy!

You can get 2X by clocking the rise and fall. And lets say you
make a short pulse that can go to 20KHz (maybe its 20us or so).
Then you can count both those edges.

If you count the edges up to some integer number (like... count to
100) it will work. But if you use that as the clock for a binary
divider, it won't work anymore.  The non-symmetrical pulse will
put you right back where you started from.  

I've been there and tried that.  If you have a square wave you can
double...
go for 4x and it doesn't work  

> Asuming we are talking edges and not 50% squares here!

(yes... you're right about the correct number of edges, but it won't do
what
he's asking for :^)   (God, I wish it DID work :^)

H^) harry