Thank you Robert for you experience,
My white LED's did have a persistence to them, so I'm going to change
them to ORG/RED (615nm). I've temporarily using some low output amber
LED's and determined that the caps I changed needed to be changed back
to original values. I also modified the zero control circuit with a 1.25
volt reference centered at zero with two switching diodes to base the
offset at zero for less drift. I,m considering using the Linear chopper
amp Randy's using. But I'm not sure how to incorporate the gain control
at S101B? The over all feedback should be no problem.
Dallas
On 9/15/2014 3:57 PM, George Atkinson wrote:
Hi,
I'm late to this thread, but have some experience. Several years ago I did
some research on replacing xenon flashlamps in a high speed fluorescence
instrument application. As the white LED candidates had phosphor coatings I
assumed (don't assume - guess ;-) that they would be too slow. It turned
out that they were significantly faster than the xenon lamps, with sharp
turn-off rather than the tail of the flashlamp.
So don't dismiss white LEDs for modulated applications.
Robert G8RPI.
On 11 September 2014 13:14, Chuck Harris <[email protected]> wrote:
Hi Dallas,
Let us know if it helps. Neons are very fast light sources, and
can switch way faster than the CdS photo resistors can respond.
A nice red/orange LED should work well with the original CdS
photo resistors.
-Chuck Harris
Dallas Smith wrote:
Chuck,
After searching for the wave length of NE2 neon bulbs, I found that the
spectrum is
between 600-650nm. So I ordered red-org at 615nm. The white LED's I've
have do have
the characteristics you mentioned, Thank you for all your input, maybe
the results
will show some improvement.
Dallas
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