SV: Re: [sdiy] X8 squarewave multiplier.

[karl dalen]

It is infact very simple! (:-) .

Take a triangle then run trough a comparator sort of
windowing, that will extract a square of 4x frequency,
then dubble edge detecting that you get two edges for 
every one inserted, thats 8x. Think in terms of "phases"
instead of zero crossings when dealing with the triangle!

Or do a sawtoth multiplyer 8X is easy,just watch spurious edges!

--- Harry Bissell Jr <harrybissell at prodigy.net> skrev:

> 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!

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

Reg
KD
   
>   It could be made to work with one-shots, but only at a single
>   frequency. Abandon this idea early....
>   
>   H^) harry
> 
> Dave Kendall <davekendall at ntlworld.com> wrote:   
> > It's a hell of a lot easier to start out with an 8X square wave and divide
> it
> > down to 1X than to generate an 8X from a 1X signal.
> 
> I'd worried about that, not ever having seen frequency multipliers anywhere
> in synth diy sites.....
> 
> > Off the 
> > top of my head the way I'd do it is leading and falling edge triggers
> > triggering one shots of the proper period. You'd have to have 3 levels of
> > those though.
> 
> I guess there might be a risk with successive trigger delays?, and changing
> voltages probably would complicate matters even further. Hmmm...
> 
> 
> Dave
> 
> 
> 
>