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Receiver Circuits
MAIN PCB
Figure 21. Receiver and MMS mode system switch
A single analog switch is employed to support both voice and MMS sound mode with EAR_SPK. In
the MMS mode the SPK_EN port sets 'H' , then the EAR_SPK will be connected with MIDI sound path
(NO) and operate as loud speaker. The other case, the SPK_EN port will remain 'L' state and
EAR_SPK will be connected with receiver path EAR_P(NC)
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