August 2021
Beginner
128 pages
5h 36m
English
Content preview from Make: Volume 78
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PROJECTS Amateur Scientist
Listening
to Light
Written and photographed by Forrest M. Mims III
Build a photophone to send
and receive sound on a beam
of modulated sunlight
United States public domain via Wikimedia
84 makezine.com
Over the years I’ve designed many electronic
circuits that transform steady (DC) or modulated
(AC) beams of light into sound. These circuits
have many applications, some of which are
described here.
BASIC LIGHT-TO-TONE RECEIVER
During my senior year at Texas A&M in 1965,
I modified a simple 2-transistor oscillator by
connecting it to a speaker and replacing its single
resistor with a light-sensitive cadmium sulfide
(CdS) phot ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.