[time-nuts] TNS-BUF update

Poul-Henning Kamp phk at phk.freebsd.dk
Sun Aug 19 04:37:11 EDT 2018

In message <1818735266.3837388.1534666949194 at webmail.xtra.co.nz>, Bruce Griffit
hs writes:

>It exploits the fact that for a RED LED at least the difference
>between the LED forward voltage and the transistor Vbe is ~ 1V and
>has a fairly low tempco and has low noise (at  least for RED LEDs).

... in darkness.

When using LEDs this sort of way, they should always be totally
shielded from all external light.

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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