[time-nuts] Generating a solid PPS from 10Mhz source
kb8tq at n1k.org
Tue Jan 19 00:19:38 UTC 2016
Some time - check out what a “60 Hz” incandescent bulb looks like when
hooked to 20 Hz …. flicker flicker flicker …
I suspect they optimize the thermal mass of the filament to reduce the flicker at
> On Jan 18, 2016, at 3:45 PM, Poul-Henning Kamp <phk at phk.freebsd.dk> wrote:
> In message <29659871.S9XTlaFu4r at linux>, Bruce Griffiths writes:
>> To detect 100Hz modulation due to photocurrents in the LEDs the 150W
>> incandescent bulb had to be placed within a few cm of the LEDs.
> Incandescent bulbs don't have much "hum" in their light output,
> they're basically heating elements and they don't cool down nearly
> fast enough.
> Try with fluorescent light instead, there's a reason people accuse
> them of flickering.
> 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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