S&H

[Gene Zumchak]

Tomg, Paul et alia,

    In my last reply which I haven't seen posted, I suggested:

    One classic S/H uses two op amps, FET ones preferably, both are
wired as
voltage followers, the output of the second feeds the inverting input of
the
first.  The second just feeds back to its own inverting input.  Between
the
first and second is a switch and the cap to ground.

    National puts that all in an 8-pin package for you.  Its called the
LF398.
Digikey lists it for $3.33 in onesies.  Looks like the simplest, and
maybe the
cheapest solution.

    I have since looked in JAMECO and found the LF398 at 1.59 for one
1.49 if you buy ten.  This is really worth trying.  Let us know how it
works.

Gene Z




Steve Ridley wrote:

> The Elektor Music quantiser did something similar.
>
> SPR