NSB-9
System Module and User Interface
CCS Technical Documentation
Page 40
Nokia Corporation
Issue 1 04/03
External Earphone Connections
Figure 12: System connector
Internal Audio
Internal Microphone
The internal microphone module and holder is mounted into the B-cover. Microphone is
omni directional. The internal microphone is connected to the UEM microphone input
MIC1P/N. The microphone input is asymmetric and microphone bias is provided by the
UEM MIC1B. The microphone input on the UEM is ESD protected. Spring contacts are
used to connect the microphone contacts to the main PWB.
Figure 13: Internal microphone connections
100nF
UEM
MICB1
MIC1N
2x33nF
MIC1P
2k2
600
Ω
Ω
Ω
Ω
@100MHz
2x2k2
4u7