[sdiy] Frequency multipliers

[Stewart Pye]

I've been experimenting with frequency multiplier / wavefolder circuits 
recently, based on descriptions of the Serge and Buchla circuits.

I've discovered that interesting looking waveforms can be generated by 
running a sine or triangle wave into op amp dead band circuits connected 
in series, with the inputs of some of the stages mixing the outputs of 
preceding stages, or the input. It's only been in simulation so far so I 
haven't heard it.

Similar results can also be obtained by connecting several moog vco type 
single transistor saw to triangle circuits in series.

The waveforms of both of these circuits vary immensely with varying 
input amplitude. I'll report back with more after I get them on the 
breadboard...


Regards,
Stewart.


Paul Perry wrote:
> just overamplifying - or otherwise making the sine wave squarer -
> will give a mix of higher harmonics.
> Making pure overtones (pure sines at 2x, 3x etc the original
> frequency) isn't terribly interesting for audio, but I think there
> is scope to do things with LFOs.
>
> paul perry Melbourne Australia
>> On Jun 4, 2010, at 1:13 PM, Joel B wrote:
>>> Are there some relatively simple analog circuits that can take an  
>>> input sine frequency of x and output a multiple of x?
>
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