[time-nuts] Generating a solid PPS from 10Mhz source

Poul-Henning Kamp phk at phk.freebsd.dk
Mon Jan 18 06:45:00 EST 2016


--------
In message <569BC23A.3030400 at arcor.de>, Gerhard Hoffmann writes:

>LEDs abused as References:

This is one of the most stupid ideas ever, because LEDs works both ways.

(Back when LED wrist-watches first came out, people soon discovered
that they would reset themselves when photographed with flash.)

If you insist on using LEDs as voltage references, the first thing
you need to do is to dip the LED in something which shields it 100%
from incoming light *including infrared*

-- 
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.



More information about the time-nuts mailing list