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Sim 548c two way audio interface MIC disconnect

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sri1234

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hi,
i'm working with sim548c module in this i have a problem in audio interface, ihave to inter face two way audio from the pins MIC1P,MIC1N,SPK1P and SPK1N. in this when I connect speaker no problem working properly, but when i connect MIC via those pins like MIC1P and MIC1N with in 1 minute the cal gets disconnected and the modem gets reset, i'm using the same circuit as referred in the SIM5X8C_HD_V1.01.



 

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