Dynacord PROMATRIX System Reference Manual page 33

Block Diagram:
DPC 4000
IN A
24V
RS-485
AUDIO
NRS 90208
+24V
1 3
JP1
2 4
MIC/
MIC
LINE
LINE
1 2
IN B
3
NRS 90233
figure 5.25
Internal Settings:
1. MIC / LINE switching and sensitivity of the MIC / LINE input
The MIC / LINE input's internal PAD-switch (S1) allows switching the channels' sensitivity between
microphone and line levels (30 dB). The GAIN-control on the module's front panel is provided to precisely
adjust the input sensitivity (range 40 dB).
In addition, a MIC/LINE jumper (JP1, pins 5-6) is located on the printed board assembly, which allows
correctly configuring the input. It is important to change the jumper accordingly (open = LINE, closed = MIC)
when changing the MIC/LINE switch.
When shipped the switch S1 is pre-set to LINE and the jumper JP1 to its open position.
GAIN setting
Left margin
Center position
Right margin
2. Phantom power
Closing the pins 1-2 and 3-4 of the jumper JP1 offers the possibility to engage 24 V phantom power for
microphones that are connected directly. When shipped, the jumper is factory pre-set to its "open" position (no
phantom power).
3. Compressor / Limiter
The MIC / LINE input channel embodies a compressor / limiter circuit which can be incorporated into the
signal path via jumper JP2 (position COMP). Normally, the compressor / limiter should be used to eliminate
the risks of overdrive and clipping, when directly connecting a microphone. When shipped, the jumper is pre-
set to its "Linear" position (LIN).
PROMATRIX System User Handbook 1.1
MON A
PILOT A
PILOT B
GAIN
LIN
JP2
COMP
COMPRESSOR /
LIMITER
block diagram MIC/LINE + paging station module
MIC / LINE setting
MIC
LINE
MIC
LINE
MIC
LINE
ELECTRONIC
PROGRAMMABLE
FUSE
A
D
MON B
JP1
LINE
MIC
5 6
MIC / LINE jumper
Closed
Open
Closed
Open
Closed
Open
DEVICE DESCRIPTIONS
+U24
+12V
-12V
+5V
RX485
TX485
INTERNAL MONITOR
PILOT
MCLK
BCLK
WCLK
DIN
4
SPI
BOARD
CONTROL
RES
BOARD
STATUS
& ID
Input level
-14 dBu
+16 dBu
-28 dBu
+2 dBu
-54 dBu
-24 dBu
ANALOG
SUPPLY
DIGITAL
SUPPLY
2 CHANNEL
DIGITAL
AUDIO
5-21