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Re: [Phys-l] "Dehatting" TO-3 bipolars to "create" photosensors

BC,
About ten years ago when John Hinton, Fred Hoffman and I were at the UVa summer institute for Physics teachers, we created a learning module for fiber optics. The "transmitter" was an LED which whose lens was drilled out to accept a plastic fiber. The "receiver" was the exact same TO-3 bipolar transistor with a hole drilled in the case to accept the plastic fiber which was glued to the silicon chip.

Not surprisingly, five minute epoxy turns out to have about the same index of refraction as lens of the LED and the plastic optical fiber and covered a multitude of construction sins.

We successfully transmitted a Walkman signal (the Eagles playing 'Hotel California') to the other side of the room using the fiber to carry the signal. Most of the amplifier and transmitter were variations on the Forrest Mims circuits.

---- Original message ----
Date: Tue, 21 Apr 2009 12:17:15 -0700
From: Bernard Cleyet <bernardcleyet@redshift.com>
Subject: [Phys-l] "Dehatting" TO-3 bipolars to "create" photosensors
To: Forum Physics Educators <phys-l@carnot.physics.buffalo.edu>, tap-l@lists.ncsu.edu, Sharing resources for high school physics <PHYSHARE@lists.psu.edu>, scaapt@stewart.unx.csupomona.edu
Cc: Nancy Seese <nancyseese@redshift.com>, "T.K.Wang Mary Brooks" <tkmary@dslextreme.com>

From Shawn's "The Citizen Scientist:


http://www.sas.org/tcs/weeklyIssues_2009/2009-04-03/project1/index.html


bc
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THO

Thomas O'Neill
Physics Teacher in Residence
James Madison University
Shenandoah Valley Governor's School