[sdiy] ca3080-based tri-to-sine

[Ian Fritz]

At 10:30 AM 10/13/05, Harry Bissell Jr wrote:

>R44 converts the OTA output current into an
>input er... current   :^P


:-)



>(IE Ian is saying that if you changed the value of the
>feedback resistor in the opamp, R44 is redundant)

Right. Since the OTA is a current source,  its output current is driven 
through the opamp feedback resistor, regardless of the value of R44.  So 
R44 appears redundant.  The only difference is that the OTA output voltage 
will move away from zero as its current output increases if R44 is 
finite.   There might be some reason to do this, for example if you wanted 
to limit the signal output by clipping with the OTA.  But I'm not seeing 
that here.  Am I missing something?

   Ian