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[matti at devo.com]

Ok, that's staraight forward enough......and it leaves me with solutions that I 
might get around to one day.

thanks.

Matti



Quoting Harry Bissell <harrybissell at prodigy.net>:

> If you have a sine wave, you can put it into both inputs of a balanced
> modulator
> (4 quadRANT) and get a sine at 2X the frequency.
> 
> If you have a sawtooth wave, convert to a triangle, offset (symmetrical
> around zero)
> and
> square it up... 2X frequency.
> 
> If you have real stable amplitude and a triangle, you can use a wave
> wrapper.
> Thierry
> Rochebois proposed one solution using a single op-amp per stage, I did
> one with a
> QUAD op-amp per stage... (gets linearity at the price of complexity...).
> You can
> cascade
> as many stages as you like, and the frequency shift available is
> proportional to the
> number of stages... any intergral shift can be gotten.... and it could
> be voltage
> controlled by varying the input amplitude... but
> 
> It will only work as a frequency multiplier with a triangle. and
> inbetween the
> frequency steps there will be horrible
> (cool horrible for a change...) distortion.
> 
> There is the Phase lock loop... but if I was willing to either accept
> overshoot and
> ringing in the frequency response (read glitches) or wait for
> slow-as-mole at sses
> response (read delay) then I'd buy a GUITAR SYNTHESIZER !!!
> 
> :^)  harry
> 
> There are tricks that you can do with monostable (one shot)
> multivibrators... but
> they usually work ONLY over a limited range of input frequency...