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dtmf with mobile and mt8870

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deepakgupta.rf

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hello every one
i make circuit with mt8870 and wnat to coonect with micromaxq3 mobile it has usb 5 pin socket and 4 wires red ,green and two copper color wires means total 4 wire and no one is common.then it is getting very hard ,how to connect with dtmf input line and with ground line.
in 4 wires which wires i shud connect with i/p line and groung line of dtmf card.


pls help me...
 

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