R.V.R. Electronica PTRL, User Manual

Page: 38 / 48

PTRL & RXRL LCD
34 / 44 User Manual Rev. 1.2 - 31/01/05
A schematic view of the modules and of the connections which compose the PTRL-
LCD is shown in the following illustration.
MAIN CARD
PANEL CARD
POWER SUPPLY POWER AMPLIFIER CONTROL CARD REDUCING CARD
24V-12V
DC CONNECTION
RF CONNECTION
A brief description of the functions of each module will follow, while the complete
schemes and the layouts of the cards are shown in the appendix.
9.1 Power supply
The power supply of the PTRL-LCD is a switching unit whose 24V main output will
formerly be reduced in order to supply the RF stage of the unit. The stabilizers for the
5V and 18V continuous voltage generation for the supply of the other circuits of the
unit are present on the power supply. Please note that the power supply is "direct
from the AC line", therefore without transformer, and it can be connected to any of the
voltages comprised between 100 and 230 V without making any regulations or manual
settings. The auxiliary 24V continuous voltage inputs are connected to the power
supply and intervene automatically in order to collide with possible AC supply
absences.
9.2 Reducing card
The reducing card transforms the voltage, coming from the switching power supply,
from 24V to 12 V which is the necessary voltage for the supply of the RF power
stage of the unit.