[time-nuts] Buffer amplifier, OP Amp, vs MMIC, vs discrete?

[Dana Whitlow]

What is a "Wenzel amp"?  Are you referring to the broad line of amplifiers
made by Wenzel Assoc?
You sound like you've got some insight into what is inside these things,
that is not available from
the datasheets from Wenzel, but I don't even know if these are what you
refer to.

Please elucidate.

Thanks,

Dana


On Fri, Apr 3, 2020 at 6:55 PM Tobias Pluess <tpluess at ieee.org> wrote:

> Hi Taka
>
> what are those discrete amp designs you mention? I have seen some, but not
> those you mention. These which I have seen seem to be quite dated, use
> strange or old parts (selected 2SC... transistors which are not so easy to
> obtain here) or have other issues.
> There is also the Wenzel amp, but building it seems to involve some black
> magic as it works only with some very sophisticated, selected, exotic parts
> and I have never seen a proper explanation about how it really works and
> how the part values are calculated (for example if you want to change the
> gain).
> As I am (mostly) not afraid of discrete circuits it would be interesting to
> which designs you mean.
>
> Best
> Tobias
> HB9FSX
>
>
> On Sat., 4 Apr. 2020, 00:07 Taka Kamiya via time-nuts, <
> time-nuts at lists.febo.com> wrote:
>
> > I'm seeing a fairly obvious trend on this list.  When it comes to buffer
> > amplifiers, many people, in fact, most I've seen recommends fast OP Amp.
> > Discrete Amp, such as ones from K5FX design, NIST design, Clifton amp,
> and
> > others are mentioned only sometimes.  Trends are similar for distribution
> > amps.  Video amps are generally not recommended.
> >
> > But I have never seen a suggestion of MMIC like ones from Mini-circuits.
> > There are few that work from DC, fairly good NF, but often too high of
> > gain.  Other than high gain, are there reason NOT to use MMIC?
> >
> > ---------------------------------------
> > (Mr.) Taka Kamiya
> > KB4EMF / ex JF2DKG
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