[sdiy] PLL's in synthesizers

[Scott Gravenhorst]

"Michael Boracci" <mboracci at nfpcomputer.com> wrote:

>Dear Sythesists Deluxe,
>Why don't we see much, if any mention of PLL's in synthesizers? It seems
>like they could be used for a few interesting things.

I put together a PLL that follows a VCO for at least 5 octaves, does
frequency multiplication and provides square wave outs at 12x, 6x, 4x, 3x,
2x, 1.5x, and 1x of the VCO's frequency.  I was surprised by how quickly
it can follow a changing VCO's frequency.  Uses a 4046 and a few 4027 JKs.
 I use it most often to generate a perfect 5th from the input.

http://home1.gte.net/res0658s/fatman/4046pll.html

I've also read of Wiard's WoggleBug which does things with the PLL's VCO
control voltage, such as output it as audio IIRC.

 

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