Re: pinhole Modulating a laser beam for sound transmission...

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Mon Apr 01 2002 - 11:08:32 PST 

Message-Id: <l03110701b8ce5feeab17@[192.174.3.125]>
Date: Mon, 1 Apr 2002 11:08:32 -0800
From: Paul Doherty <pauld@exploratorium.edu>
Subject: Re: pinhole Modulating a laser beam for sound transmission...

Hi Jeff

The instructions are in the new Snackbook "Square Wheels"
Several activities are on line
check out the snack pages on the explo website

www.exploratorium.edu/snacks

The snack Modulated LED is on line at

http://saturn.exploratorium.edu/square_wheels/modulated_led.pdf

While we suggest an LED you can substitute a flashlight bulb

Paul D

><<
>>At a past TI workshop we were shown how to wire a
>>flashlight or laser so that it could be hooked up to a
>>radio. The beam would then travel to a photo cell that
>>was hooked up to an amplifier or speaker. You could
>>hear the music from the speaker. Amazing! I have
>>lost my notes and would love to build this. Can
>>anyone respond and talk me through the construction
>>with some clear instructions. Its a very dramatic
>>demo and other teachers would probably enjoy this as
>>well. Thanks, Jeff in Vacaville
>>>
>

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