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mt8870 interface to sim300

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kamranraj

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hi salam to all

landrover_schematic_atmega16.jpg

i make this circuit,attach "nokia c200" is working normally. then i attach sim300cz this circuit not working.
sim300cz also working gavin DTMF output.
 

reduce the R1&R2 values in the schematic and then try it

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reduce the R1&R2 values in the schematic and then try it
 

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