[sdiy] FET for VCO cap discharge

[JH.]

> Might be worth taking a look at the voltage present at the op amp (-)
> input - it might not be sitting steadily at zero volts at virtual ground -
> could be spiking briefly during the reset time if the op amp isn't fast
> enough to keep the servo loop closed. If the (-) input went just a couple
of
> hundred mV below ground it would be enough to make the FET conduct quite a
> bit more current.

Interesting! I should try this.

But maybe there's another reason for my sub microsecond readings.
I just measured the mere downslope of the saw, not the total delay
before the FET even starts to conduct, nor any delay before the
voltage strats to rise again. That's becaise for my application
it's not the tracking errors I want to minimise, but only the glitch
in the triangle shaping.

JH.