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

[Tobias Pluess]

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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