[time-nuts] Re: thermodynamics of time keeping

[Dana Whitlow]

Perhaps the author is trying to include Schmitt triggers to sort of emulate
mechanical escapements.
I've occasionally used the things (Schmitt triggers) to help square up
sinewaves, but never in a case
where I was concerned about stability or jitter.

BTW, how do three inverters constitute a Schmitt trigger?  Note: Wikipedia
spells it 'Schmitt',
'not 'Schmidt'.

Dana


Dana



On Tue, Sep 7, 2021 at 3:11 PM Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:

> --------
> Richard Karlquist writes:
>
> > He lost me when he started talking about quartz clocks utilizing
> >
> > Schmidtt triggers.  Never heard of that before and I'm going on
> >
> > 50 years of designing oscillators.
>
> I bet you just forgot about it:  The classical 3-TTL-inverter
> clock-generator was used almost everywhere, including in quite
> a number of HP products.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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