Filter
Top Products
Comms and Final video output stage
The signals from the main board travel up to the
Comms board on connector
CON902
.
The
Video signals
simply travel via an A-C coupling
net before exiting the player via the RCA-phono
sockets at locations
SKT902
and
SKT903
.
The
RS232
interface is on 9 way “D” type CON900,
with IC900 providing the level translation and static
protection between the RS232 levels and the
3.3V
CMOS levels required by the VADDIS V,
CON900
also supplies a
+5V
Status level when ever the unit is
not in standby this generated from a buffered version
of the
AV_ENABLE
signal as used within the SCART
output stage (0V in standby).
We have two remote input bus’s on this board, the first
can be seen to arrive at
SK901
on a 3.5mm mono jack
signal received should be a
36Khz
modulated RC5
signal, the RC5 data then travels to the front panel and
is fed to IR led that is sited just behind the front panel
IR Sensor
, we use the sensor to demodulate the and
opto-isolate the signal due to the fact that the signal is
floating up from ground.
The 3.5mm socket at location
SKT900
is used to
receive un-modulated RC5 the 0V representing a
space (equivalent to no-infra-red carrier), this input is
effectively wire-Ord with the front panel IR receiver on
IRRCV
these take the form of a 5V/0V RC5 signal,
with 5V representing a mark (equivalent to a burst of
36Khz carrier on infrared) and 0V representing a mark
(space), the signal is simply inverted and wire-ord to
the display board Infra-red led via
TR900
.