S&H

[Scott Gravenhorst]

http://www.uni-bonn.de/~uzs159/sah.html

"Paul Maddox" <Paul.Maddox at wavesynth.com> wrote:
>Dear all,
>
>  Im trying to get a sample and hold working, useing an OPAMP, CAP and FET..
>
>signal comes in, goes to Source of FET, Drain of FET goes to Non inverting
>terminal of opamp,
>and inverting goes to output... all straight forward..
>
> Question, HOW do I gate the damn FET??
>Im useing a 2n3819,
>Im guessing to be OFF (open circuit) the Gate should be at 0v (or should it
>be -VCC?) via resistor (1K in my case)
>And to turn it on, it should go (breifly) to +VCC... am I right?
>
>My S&H I just built doesnt seem to work, it stays permanently open :-(
>
>Suggestions?
>Schematics?
>URLs?
>
> Its for my new module in my modular, I have a LAG processor (cap+opamp+var
>resistor) S&H (above cursed thing)
>and a noise gen which gives PINK, WHITE and BLUE (works like a dream)
>
>Paul
>
>
>

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