Overshooting circuit ?

[Dan Gendreau]

> I know that Opamp designers do hell of a lot of work to make their
> devices as perfect as possible (low noise, fast etc.), and most modern
> Opamps do have internal circuitry to prevent overshooting.
> But i want a circuit that does exactly this. For example, when the input
> signal raises quickly ,say from 0 to 5 Volts (maybe a gate signal),
> i want the output voltage to go from the initially 0 V to 8V, then 3 V,
> then 7 V, then 4 V, then 6 V, then finally the 5 V. I do not know if my
> description is clear; i do want a damped oscillation, preferrably with
> VC damping.
>
> My intention is to put a square wave from an LFO in the input, and
> hook the output to a VCO, so i expect to get sort of a
> "Sproioioinnng..." sound.

The effect you describe is exactly what you get from a resonant low-pass
filter with heavy feedback.

Try it. Look at the non-overdriven waveform from a TB303 with heavy
resonance...

-Dan G.