[sdiy] Frequency multipliers

[cheater cheater]

you guys are forgetting the simplest ever technique which is just
overdrive. OTA style or diode style. There's a reason it's called
'harmonic distortion' :-)

I believe there are circuits that have very selective harmonic
distortion, either second- or third-harmonic. Remove the first
harmonic from their output (by utilising the source signal) and you
have a sinewave frequency doubler or tripler. Chain for more.

Regarding frequency shifters: I'd recently used a digital multiband
frequency shifter - so a vocoding splitter, and every output band was
shifted with a separate multiplier. Sounded really cool and grungy,
most recommendable. Forget what the VST was called, though.

Cheers,
D.

2010/6/5 René Schmitz <uzs159 at uni-bonn.de>:
> George Hearn schrieb:
>>>
>>> Are there some relatively simple analog circuits that can take an  input
>>> sine frequency of x and output a multiple of x?
>>
>> A phase locked loop (4046 etc) with a counter in the feedback path can
>> produce integer multiples of your input frequency, in-phase.  These will
>> be
>> square waves but could be shaped.
>
> If you use a sine VCO to close the PLL, you can get sinewaves of course.
> Nothing forces you using the internal VCO of the 4046.
>
> Cheers,
>  René
>
> --
> uzs159 at uni-bonn.de
> http://www.uni-bonn.de/~uzs159
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