[sdiy] Frequency multipliers

[René Schmitz]

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

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uzs159 at uni-bonn.de
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