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VOLTAG
REGULATORS
Voltage regulators produce fixed DC output voltage
from variable DC (a small amount of AC on it). Normally we get
fixed output by connecting the voltage regulator at the output of
the filtered DC(see in above diagram). It can also
used in circuits to get a low DC voltage from a
high DC voltage (for example we use 7805 to get 5V
from 12V). There are two types of voltage regulators
1. fixed voltage regulators(78xx,79xx)
2. variable voltage regulators(LM317)
In fixed voltage regulators there is another classification
1. +ve voltage regulators
2. -ve voltage regulators
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