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Principles of Analog Electronics
book

Principles of Analog Electronics

by Giovanni Saggio
January 2014
Intermediate to advanced content levelIntermediate to advanced
567 pages
23h 13m
English
CRC Press
Content preview from Principles of Analog Electronics
Some Applications
531
acitivates an LED by light; the circuit in Figure 15.14b activates the LED by
darkness. The resistor R
3
limits the current owing through the LED.
It can be more effective to activate another load, rather than a simple LED.
The load can be even another circuit just “activated” by the light/darkness. For
example, a lighting system can be switched on at nightfall. To this aim a relay can
be helpful.
A relay is an electromechanical switch controlled by a current. It operates by
means of an inductor that, when energized, generates a magnetic eld acting on a
metalic arm, which makes up a physical contact, so as to close or open ...
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Publisher Resources

ISBN: 9781466582026