Frequency Doublers was "rant city"

[Harry Bissell]

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...

matti at devo.com wrote:

> Eh, but what about, say, Bach? He managed to do quite a lot with _his_ feet.
> Also, having but one instrument with but one parameter to control with one's
> feet simply does not help at all. That aside, I'm thinking that a few stomp-able
> buttons and wah-style-whatever-the-variable-resistors-are-called arried on the
> floor about one's feet would very much alow a great deal of expression.
>
> That aside, has anyone any schematics for frequency-_doublers_? Blacet and paia
> offer their octave dividers, but that still leaves one an octagve below what one
> is playing.
>
> Matti (wondering why his 555's suddenly up and stopped working)
>
> Quoting WeAreAs1 at aol.com:
>
> > Yeah, and look what those battalions of guitarist's feet have given us
> > over
> > the last 40 years:  An endless parade of sullen, skinny, dull-eyed,
> > long-and-scraggly-haired "musicians" interminably making with the
> > "wah-wah-wah-wah", almost invariably opening and closing their mouths in
> > sync
> > with the masturbatory motion of their smelly sneakers upon the Crybaby,
> > like
> > so many stoned aquarium fish, Jimi Hendrix notwithstanding (God rest his
> > soul).
> >
> > Mike B.
> >