LESSON 1
ELECTRON TUBES AND SOLID-STATE DEVICES
SCOPE ....................................Operation of electron tubes and solid-
state devices; applications of electron
tubes
and
solid-state
devices
in
electronic
circuits,
to
include:
rectifiers, amplifiers, and oscillators.
CREDIT HOURS .............................3
TEXT ASSIGNMENT ..........................Attached Memorandum, para 1-1 thru 1-3
MATERIALS REQUIRED .......................None
SUGGESTIONS ..............................None
LESSON OBJECTIVES
When you have completed this lesson, you should:
1.
Be able to identify
triode,
and
tubes
from
the
schematic symbols.
2.
Be
able
to
identify
junction
diodes
and
from
the
schematic
symbols.
3.
Know the characteristics of electron tubes.
4.
Know the characteristics of solid-state devices.
5.
Know
the
applications
of
tubes
and
solid-state
devices
in
electronic
circuits.
ATTACHED MEMORANDUM
1-1.
ELECTRON TUBES
a. General.
An electron tube is a glass or metal envelope enclosing metal
electrodes in a vacuum.
(1) Cathode.
When heated, the cathode emits electrons.
The directly
heated cathode (A of fig. 1-1) is a single filament.
The indirectly
heated cathode (B of fig. 1-1) is a metal sleeve that is heated by an
enclosed filament, or heater. In either case, a voltage applied to the
filament causes current to flow, which generates the heat.
309 L1
2
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