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Deva Seetharam

today i added a speaker and a microphone to the tuxphone. i called my cellphone from tuxphone. i can hear my cellphone clearly on tuxphone; i can barely hear the tuxphone on the cellphone.
i know the reason - the gm-862 hardware guide recommends a proper biasing circuitry for microphone. since i am lazy and i wanted to see it work, i just used the simple test circuit suggested by sparkfun (http://www.sparkfun.com/tutorial/Port-O-Rotary/portable-rotary.htm).

unfortunately, it doesn't work well for me. i need to refine the circuit.

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