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

[Bernard Cleyet <bernardcleyet@redshift.com>]

Hej!

Die Panzer!

Most interesting -- I'll remember the optical coupling glu.

bc has used  very viscous silicon oil (MPT to light pipes and  
paddles, etc.)


On 2009, Apr 21, , at 14:52, Thomas O'Neill wrote:

> 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 ----
> >

cut

> > From Shawn's "The Citizen Scientist:
> >
> >
> > http://www.sas.org/tcs/weeklyIssues_2009/2009-04-03/project1/ 
> > index.html
> >
> >
> > bc
> > _______________________________________________
> > Forum for Physics Educators
> > Phys-l@carnot.physics.buffalo.edu
> > https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
> THO
>
> Thomas O'Neill
> Physics Teacher in Residence
> James Madison University
> Shenandoah Valley Governor's School