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Posted by Anthony Matonak on November 4, 2005, 1:31 am
Jeff Thies wrote:

You pry off the top part of the case to expose the transistor.

This works with any transistor or diode though the amount of
power you get is proportional to the size of the semiconductor.
Big power transistors work best though LEDs have the advantage
of having the semiconductor already exposed to light. There is
even a fellow who uses this principle to make inexpensive solar
trackers using green LEDs for the photosensors.


Posted by Duane C. Johnson on November 4, 2005, 1:40 am
Hi Jeff;

 > ewitte@hotmail.com wrote:

 > How in the world do you do that?

Cut the top off the TO-3 packaged metal
cased units.

When I worked in a components testing lab we
had this cool tiny tool that was a miniature
can opener.

Or, just use a grind stone or file and the top
comes right off. The aluminum ones are easier.

 > 2N3055 are not light sensitive in as much as
 > they are enclosed in either metal or plastic!

 > Cheers,
 > Jeff


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Posted by Steve O'Hara-Smith on November 4, 2005, 6:40 am
 On Thu, 03 Nov 2005 19:40:35 -0600

    Be *very* careful some TO3 can transistors contain beryllium
oxide as a heat transfer agent - it is a fine toxic powder that you *really*
don't want in your lungs.

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Posted by ewitte on November 4, 2005, 5:02 pm

Mine had a rubbery white substance on it that had to be removed before
doing any testing.  With a normal 1" mag lens I'm getting 0.675volts at
up to 50ma.  I'm going to be trying it with a 10 inch fresnel lens soon

Posted by BobG on November 5, 2005, 1:38 am
I'm getting 0.675volts at up to 50ma.
Regular cells are .42-.46V at several amps (but they have a lot more

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