** See pics of a NPN transistor chip emitting light.

No trick.



..... Phil

Phil Allison wrote:

** See pics of a NPN transistor chip emitting light.

No trick.



.... Phil



OOOOh!
What biasing is used?

On Wed, 08 Oct 2008 22:55:33 -0700, Robert Baer
wrote:

Phil Allison wrote:

** See pics of a NPN transistor chip emitting light.

No trick.



.... Phil



OOOOh!
What biasing is used?

Usually zenering the b-e junction. It doesn't generate much light.

One can zener the b-e junction, to make light, and use the b-c
junction as a photovoltaic generator. That can be used as a very
ineffficient polarity inverter.

John

John Larkin wrote:

Robert Baer wrote:
Phil Allison wrote:

** See pics of a NPN transistor chip emitting light.

No trick.

.... Phil

OOOOh!
What biasing is used?

Usually zenering the b-e junction. It doesn't generate much light.

One can zener the b-e junction, to make light, and use the b-c
junction as a photovoltaic generator. That can be used as a very
ineffficient polarity inverter.

I have vague recollections in my hobby days of one of my friends finding
that the cheap surplus point-contact diodes that were many a hobbyist's
mainstay would emit a tiny amount of light too.

Graham