figure 1-13D). In addition to the symbol, transformers are generally
labeled by the letter "T."
d. Power Supplies.
Like transformers, power supplies are not a
true power source.
They generally take an input from an external,
power source and convert that source to usable voltages to operate
the circuits they supply. Typically, a power supply will convert an
AC input into one or more DC outputs. Most power supplies consist of
four basic sections: a transformer; a rectifier; a filter; and a
regulator.
Figure 1-14 shows a simple block diagram of a power
supply and the effects of the basic components.
Figure 1-14.
Basic Power Supply.
Power supplies may be designed to produce one or several different
output voltages. Depending on the complexity of the circuit demand,
power supplies may be fairly simple or they may be quite extensive.
Often the power supply for a circuit will require a separate
schematic diagram to illustrate the components and functional
operation of the power supply.
Figure 1-15 illustrates a schematic
of a simple power supply.
Power supplies are labeled with the
letters "PS." the
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