Low-Frequency Multiplier

Posted on Sep 9, 2012

This circuit uses a comparator as a Schmitt trigger (311H) and two active bandpass filters (LM318H). 3-kHz output

Low-Frequency Multiplier
Click here to download the full size of the above Circuit.

is obtained. Higher harmonics (preferably odd) can be obtained by tuning the active filters to the desired frequency. can be 1, 3, 5, 7, 9, etc. Even harmonics can be produced by substituting a full-wave rectifier or absolute-value circuit for the Schmitt-trigger comparator.

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