Internal Microphone - Nokia 6233 Service Manual

RM-123; RM-145
System Module Nokia Customer Care
Figure 61 Audio block diagram

Internal microphone

Internal microphone is used for HandPortable (HP) and Internal HandsFree (IHF) call modes.
An analogue electret microphone is connected to N2200 Mic1P and Mic1N inputs via asymmetric electrical
connection.
The microphone is biased by N2200 MicB1 bias voltage output.
Issue 1 COMPANY CONFIDENTIAL Page 8 –15
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