[sdiy] CA3080 VCO

[Jim Patchell]

    Yes, although, I cannot point you to the schematic you want, here is a
schematic of an "Ota" based triangle VCO that I did:

http://www.silcom.com/~patchell/jp2rest/dualvco.pdf

    I built the OTA out of a THAT140 transistor array, which gave the
advantage of being able to use an NPN based exponential converter.  Also,
there is an electronic temperature compensation circiut the eliminates the
need for a +3300ppm compensation resistor....Although, this is in some ways
like saying "Why use on two by four, when five or six will do the same
job?" ;^)

    -Jim

Casey Crane wrote:

> Hi all,
>
>         Years ago, back in the 70's when I was getting the electronotes
> newsletter I remember seeing a schematic for a nice triangle/square VCO
> built around a CA3080 OTA. Does anyone know what I'm talking about ? Is
> there a schematic of this somewhere on the web ?
> Casey
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