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

Bob Camp kb8tq at n1k.org
Mon Jan 18 19:19:38 EST 2016


Hi

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
50/60 Hz.

Bob

> 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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