[sdiy] OTA to voltage-control resonance?

[Jerry Gray-Eskue]

What sort of issues were you having with the design?

- Jerry

-----Original Message-----
From: Ian Fritz [mailto:ijfritz at comcast.net]
Sent: Monday, August 31, 2009 8:53 AM
To: Jerry Gray-Eskue; Synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] OTA to voltage-control resonance?


At 06:55 AM 8/31/2009, Jerry Gray-Eskue wrote:
>... I was wondering if
>anyone would care to comment on the merits of the "Logarithmic Current
>Source" shown in figure 30 of the National LM13700 data sheet.
>
>I see that PAIA is using a variation of this circuit and claims that the
use
>of the linearizing diode provides temperature compensation.

I don't know about anybody else, but I never had any luck getting that
design to work very well.

   Ian