The Type 7805 voltage regulator
cannot handle input
voltages higher than 35 V. If
only voltages higher than 35 V
are available, it is, of course,
possible to shunt the input
with a zener diode. However,
since prices of standard voltage
regulators are low, there
are advantages in using a second
regulator: the stability of
the output voltage as weIl as
the hum rejection will be improved
appreciably.
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