RH-18/36/38 Company confidential
Engine module CCS Technical Documentation
Page 20 Nokia Corporation. Issue 1 10/03
Two dust shields will be used: one in the gap between earmat and A-cover and one on
the C-cover.
The earpiece circuit includes only a few components:
two 10 ohm in order to have a stable output
an EMC filter
Figure 4: Earpiece interface
Microphone
An omni directional microphone is used. The microphone is placed in the system connec-
tor sealed in its rubber gasket. The sound port is provided in the system connector.
Figure 5: Bottom connector including the microphone
The microphone connection comprises a differential bias circuit, driven directly from the
MICB1 bias output with external RC-filters.
EARN
EARP
EARP
EARN
UEM
10
ohm
10
ohm
Placed near UEM
Placed in top of
PWB, near
earpiece
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