[sdiy] Sample and Hold

Pete Hartman pete.hartman at gmail.com
Thu Jun 7 18:51:05 CEST 2018

I have the impression that it's pretty widely used.  Very easy, I have a
project with two of them about ready to hit the usual DIY outlets.  I had
the impression that the sample input needed to be 5V, so I used an LM78L05
and a LM339 comparator pulled up with the 5V to do the sampling.

Also: don't measure your voltage directly from the hold cap, you'll drain
it and wonder why your droop is so terrible.  << voice of experience ;-).


On Thu, Jun 7, 2018 at 11:21 AM, Elain Klopke <functionofform at gmail.com>

> Hey all,
> In my poking around the internets for sample and hold circuits, I ran
> across the Texas Instruments LF398 monolithic sample and hold. It looks
> promising, +/-5 to +/-18V supply range, up to +/-18V input range, TTL and
> CMOS compatable logic input, all in a DIP8 package.
> Does anyone have any experience with this chip?
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