[time-nuts] Low noise power supply recommendations

Will Matney xformer at citynet.net
Wed Jun 15 14:41:54 UTC 2011


Paul,

No, not the direct light emitted from the LED, but the extra current the
cell passed was probably over their limit. I thought of placing the LED's
vertical to the Lucite rods, instead of horizontal, or head-on, to decrease
the intensity. From the side, a LED, it's much dimmer. The NE-3 bulbs are
placed this way, but that's about the only way to get the most intensity
from them. Another thought would be to place a filter between the LED's and
the rods to dim them down.

What I was going to do was measure the voltage across the CDS cells, with
the neon bulbs running, and try to get a LED to create the same voltage
drop, or same amount of current through the cell.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 6/15/2011 at 2:25 PM Poul-Henning Kamp wrote:

>In message <201106151021530546.2070A4A5 at smtp.citynet.net>, "Will Matney"
writes
>:
>
>>My guess is that the LED's brightness helped kill the CDS cells. 
>
>That is not possible by direct effect, light does not hurt CDS cells.
>
>It is far more likely that more intense light than designed has decreased
>the CDS' resistance causing higher current than was good for them.
>
>
>-- 
>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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