[sdiy] function generation

[Scott Gravenhorst]

WeAreAs1 at aol.com wrote:
>
>In a message dated 11/8/03 11:48:48 AM, music.maker at gte.net writes:
>
><< Wow, that's in interesting circuit.  I will just have to give it a try, 
>I'd always assumed that the
>8038 was hopelessly nonlinear, but Tom's control voltage technique apparently 
>linearizes this bad
>boy chip. >>
>
>Hello Scott,
>
>If you do try building that design, please keep us informed on the results, 
>OK?

You bet.  I took another look at the Intersil data sheet for it and there is a
linearized version, similar to Tom Henry's.  I have difficulty understanding
exactly what the zener diode does for the Intersil circuit and why Tom's
version doesn't need it.  The opamp feedback is also different, it looks to me
that Intersil did not put the chip into the feedback loop as Tom did, unless
that's what I don't understand about the zener.  Tom's version looks a bit more
straight forward than Intersil's.  The Intersil circuit also powers the chip
from zero volts and negative 15.

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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