FM Transmitter
Sistemas Electrónicos S.A EM 100 DIG
Technical Manual - v1.2 - November 2005 56
3.7 Power Supply.
The main switching power supply is a sturdy unit , having a high-efficiency, S-240-30. A diode bridge
full-wave rectifies the power transformer secondary voltage in the externally preset 88~132V
AC
or
176~264V
AC
mains range transformer tap. The power supply accepts mains input variations
generating an unregulated DC voltage which is used by the regulator as input voltage. This unit is
intended to be replaced as a whole unit in event of damage, and not to be repaired in the field. This
power supply delivers +30V
DC
to the load, at a nominal power rate of 240W.
WARNING
IN THIS UNIT, MAINS VOLTAGE AND OTHER DANGEROUS VOLTAGES ARE PRESENT.
DO NOT MAKE ANY INTERVENTION ON THE BOARD WHEN IT IS CONNECTED TO
MAINS. SERVICE IS LIMITED TO LABORATORIES ONLY.
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