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These are class room hand outs for some high school science class demonstrations I helped put together about 20 years ago (at link below). The last two pages were added on the second time around along with some new equipment. Some pictures to follow but not all equipment will be shown since they are currently missing.
See also:
Step 11: Audio Modulated Flashlight
Step 12: Photo Transistor / Lens Assembly for Receiving Light Modulated with Analog Audio
http://www.instructables.com/id/Luxstars-Scratch-Pad/
Next week I will be doing a new instructable for the latest version of the audio modulated flashlight and a simple light wave receiver to go with it. That will be posted here:
http://www.instructables.com/member/luxstar/?show=INSTRUCTABLES
Here it is:
only 3 parts.
http://www.instructables.com/id/Easy-Light-Beam-Transmitter-Only-3-Parts/