[sdiy] Frequency multipliers

George Hearn georgehearn at btinternet.com
Sat Jun 5 17:55:22 CEST 2010

> 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.

> - Joel


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