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SIM800L(MT6261)_Hardware Design_V1.01 49 2016-07-07
The earphone is often used for FM antenna, as an example, the pin GND of the 3.5mm earphone is connected to
the FM interface. The circuit is recommended as following:
Moudle
GND
R303
C303
C304
FM_ANT
Figure 49: GND pin of the earphone use to be the FM antenna interface
Normally, R303 are 0Ω,C303\C304 are not mounted.
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