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Andrew Rossmann
 
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In article ,
says...
I know all diodes actually emit photons, but this tiny glass Zener is
the first one Iv'e seen actually glowing LED red. Is it bad?


Does it have a reference designator silkscreened near it? LED's and
Zener's often, but not always, use designators other than Dxxx or CRxxx.
(LEDxxx, DSxxx, ZDxxx, Zxxx).

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