be identified by a Joint Army-Navy (JAN) designation marked on the
case of the transistor.
Always replace transistors with ones that
have the identical markings or a correct substitute. To ensure that
you use an identical replacement or correct substitute, consult the
equipment manual.
5. Digital Circuits. Digital circuits have been employed in an ever
increasing number of applications. A digital circuit may operate as
an electronic switch and is capable of making decisions or logic.
Such a logic circuit represents a relationship between two or more
variable inputs and a resultant output. Digital logic circuits form
the basis for most types of computers.
Digital circuits use gates,
flip-flops, registers, and matrixes to perform a variety of
functions.
Digital circuits are often used in Army fire control
instruments as counters, registers, displays, and other logic
functions. Figure 1-44 illustrates a digital parallel counter.
Figure 1-44.
Parallel Binary Counter.
6.
Complex Circuits.
Most schematic diagrams you will find in
equipment technical manuals will be much more complex than the simple
circuits illustrated in this lesson thus far.
Most circuits are a
combination of the simpler circuits, arranged in a configuration to
provide a series of electrical events, in order to produce some
desired output or outputs.
Figure 1-45 illustrates such a circuit.
Input signals are introduced into the circuit through plug P1,
processed through a series of electrical and electronic components,
and output, again through plug P1.
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