Optics Demystified by Gibilisco Stan
Author:Gibilisco, Stan
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2009-08-09T16:00:00+00:00
A SIMPLE TRANSMITTER
Figure 6-4 is a block diagram of a simple modulated-light voice transmitter that can be built for a few dollars using parts available from electronics supply houses. This circuit uses a microphone, an audio amplifier, a transformer, a current-limiting resistor, an LED, and a source of direct-current (DC) power such as a battery. Complete audio amplifier modules are sold in some hobby stores for reasonable prices. Alternatively, a simple audio amplifier circuit can be built using a rugged bipolar transistor or operational amplifier (“op amp”) chip. Ideally, the module or amplifier should have a built-in gain control.
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