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for my project I have to upgrade Sim900D firmware to have some extra feature. Then I face a problem, some module occurs error when I tried to. finally I cant success with 2 module(out of 10), the rests module working fine.
Hi betwixt . I need you attention. Its an emergency.
My problem is, I connect mt8870 with SIM300C GSM module and PIC18F2550 for reading DTMF output. Every thing is working fine but sometimes STD (pin15) of mt8870 blinking (LED connected) for several times for a single DTMF tone. My software...
If I connect the mic and speaker directly with the soundcard, i know its work. but i have to connect more then 1 module with PC. So I need an ADC,DAC IC for each module.
I need to select an audio codec IC to convert analog voice of sim300c into PCMU/PCMA and inversely PCMU/PCMA signal is convert into analog voice which is connect with the mic of sim300c.
Need suggestion for choosing the chip and also schematic .
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