4046 VCO experiment

[Scott Gravenhorst]

I see this in the datasheet.  Scratch one VCO chip.  It's
down to AD654 or 566 or FatMan style (with ICM7555).

Jim Patchell <patchell at silcom.com> wrote:
>  A couple of days ago I posted a message that listed the linearities
>of selected (and ancient) VCO chips.  Even over 1 decade, the XR2206
>would not make a good musical VCO (I already forgot the number that I
>posted, but it was about 2% over 10:1, much worse over 1000:1, something
>like 5-8%).  I don't really understand why some of these oscialators are
>so bad.  And I can understand why one would want a single chip,
>inexpensive solution to a VCO (I really wish the CEM3340 was still in
>production).
>
>    The thing that amazed me was that the 8038 was the best of the lot
>(with a 0.2% linearity).
>
>    Has anybody tried the off the shelf V->F converters?  I seem to
>remember that some of these are down in the 0.01% linearity range.

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