Overshooting circuit ?
Harry Bissell
harrybissell at prodigy.net
Wed Dec 29 18:29:02 CET 1999
What you want is a resonant lowpass filter. This part is easy, there are
lots of designs on the web. The resonance sets the amount of ringing
(damping) and the center frequency sets the period of the ringing
oscillation.
It would be easy (in most cases) to increase the size of the capacitors in
the filter to allow the lower than normal frequency range (most are audio
range)...
The hard part is if you want a filter that is "DC accurate"... if you put in
1 volt then after the settling time you would get exactly 1 volt out....
Most of these filters are AC coupled, so they do not have DC capability.
Maybe some other list members have a better solution ???
:^) Harry
Michael Buchstaller wrote:
> Hello Group,
>
> i have a simple question, but did not find an adequate solution for
> it, so i will ask the Gurus here ;-)
>
> 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.
>
> Can anybody point me in the right direction ?
>
> -Michael Buchstaller
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