Technical Manual
Issue 2.1
4000 Digital Series
II
Page 64
STA0381
3.10 PDE 4538 Panel Electronics Card
The PDE4538 is the panel processor card for non-19" 4000 series II panels.
It provides microphone amplifier/loudspeaker amplifier/power supply/processor/memory and control
interfaces.
Figure 58 - PDE4538 Panel Electronics Card
3.10.1 PDE4538 Circuit description
U8 is the microphone amplifier 30 to 60dBs of gain, which is software selectable by U6. Up to two
microphones can be connected to CON3 & 4, one of which is software selectable at any one time via U7.
Note:
Both microphone circuits are factory fitted as unbalanced with 12V phantom power.
U9 & 10 provide another 20dB gain and a limiting circuit of 8dBu.
U12 provides a balanced output for the matrix
U16 is the loudspeaker amplifier.
U11B provides software selectable loudspeaker mute and TR2 software selectable 12dBs of
loudspeaker dim.
U14 is the headphone amplifier, which has a jumper patch (LK10), for selecting left and right audio
inputs to left and right earpieces. Sidetone is software selectable via U11A and U11D.
U15D converts balanced audio from the matrix and U15C mixes it with audio from the panel options
cards (PDE4536/PDE4537/PDE3561). Analogue level controls (100K linear potentiometers) can be
fitted to CON14 and 15.
U2 is the 5V switching regulator. It takes 24Volts in via CON2.
It is synchronised with the main CPU clock and a power fail flag is provided to the CPU to allow
emergency data saving.
U25
U30
U27
U22
U21
U2
U20
U17
U19
U18
U23
U24
U26
U16
U3
U10
U9
U8
U6
U7
U15
U11
U12
U4 U22
CON
5
CON
4
CON
3
LK10
CON
14
CON
15
CON2
CON10
CON7
CON11
CON8
CON17
CON13
CON
16
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