SV: [sdiy] QVCO schemo up

[JH.]

> > The stupid diode biasing system of the 13700 forces
> > the common mode input voltage to some positive value,
> > which means the resistor that feeds the input signal
> > draws a hefty bias current, and unbalances the input.
> > So you have to set the offset trimmer to an odd value
> > even if you'd have a perfect OTA.
> 
> Does this also occur if the impedances at both terminals are
> equal? 

What I meant to say is that you set the trimmer such that the
resulting impedances are equal, resulting in on off-center
position if the signal-feeding input resistor isn't AC coupled.

JH.