Added Info ELECTRONICS NOW Aug 1996 (v.67#8) pg. 10
Modulating a laser beam in order to transmit sound.
ELECTRONICS NOW Mar 1997 (v.68#3) pg. 73
Simple light beam communications demonstator shows how to "talk on a beam of light". Est. cost: $15.
ELEMENTARY ELECTRONICS #763 Winter 1965 pg. 110
Photo-transistor receiver and LED transmitter works on visible or invisible light, with or without fiber optics. This unit demonstrates the basic theory and circuitry.
ELEMENTARY ELECTRONICS Mar-Apr 1976 (v.16#2) pg. 61
Light beam communicator. Hand-held transciever allows line of sight communication up to 1000 meters. Estimated cost for two units: $100.
ELEMENTARY ELECTRONICS Nov-Dec 1980 (v.20#6) pg. 33
How lightwaves are changing communications. Includes schematics for simple lightwave transmitters and receivers.
MODERN ELECTRONICS [2] Oct 1984 (v.1#1) pg. 86
Audio amplifier experiments. Includes construction of a simple audio amplifier, underwater hydrophone, light-sensor/amplifier combinations, and a basic "photophone" system.
MODERN ELECTRONICS [2] Apr 1986 (v.3#4) pg. 66
High-sensitivity lightwave receiver and transmitter for experiments in lightwave communication.
MODERN ELECTRONICS [2] Oct 1990 (v.7#10) pg. 51
Experimenting with light-beam communications. Only a few simple components are needed to get started.
POPULAR ELECTRONICS [1] Apr 1975 (v.7#4) pg. 40
Talk over a sunbeam with a Photophone. Modern version of Alexander Graham Bell's sunlight communicator. Usable up to 1/2 mile. A small mirror is modulated by the voice. Reflected sunlight then becomes the carrier which is received by a large parabolic mirror and amplified.
POPULAR ELECTRONICS [1] Feb 1976 (v.9#2) pg. 54
The photophone centennial: 1880-1980. Includes tips on building your own photophone to transmit sound over a beam of reflected sunlight.
POPULAR ELECTRONICS [1] Apr 1980 (v.17#4) pg. 74
Circuit for an amplitude-modulated light-wave voice communicator transmitter and receiver. Build from inexpensive, readily available components.
POPULAR ELECTRONICS [1] May 1980 (v.17#5) pg. 103
Build a light-beam communicator. These transmitter and receiver circuits allow you to communicate over short distances using an ordinary flashlight.
POPULAR ELECTRONICS [2] Oct 1991 (v.8#10) pg. 41
Voltage regulator applications. (1) In-rush current limiter circuit keeps current at the rated operating level of the device to be protected. (2) Visible-light transmitter circuit. (3) Visible-light receiver circuit. (4) Using two common voltage regulators to vary both voltage and current. (5) Circuit to control a small DC motor or small lamp.
POPULAR ELECTRONICS [2] Mar 1992 (v.9#3) pg. 70
Light-beam communicator. Use the light from a high-intensity LED to communicate up to one-half mile. Est. cost: $98. Part 1.
RADIO-ELECTRONICS Jul 1989 (v.60#7) pg. 31, 56
Light-beam communicator. Part 2.
RADIO-ELECTRONICS Aug 1989 (v.60#8) pg. 52
Device to demonstrate the transmission of sound over a beam of light. One of several simple experiments.
SCIENTIFIC AMERICAN Jan 1973 (v.228#1) pg. 116