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chat-cord--> connect ur phone to PC


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hi all
i have been working on this project from 2 weeks.it worked nice.
it is really worth making circuit.

IMG_4354.JPG

there 2 types of circuit.
1.it uses 600:600 center tapped transformer
  http://www.grynx.com/projects/build-your-own-chat-cord/1/

2.this uses combination of resistors and capacitors for audio processing
http://www.grynx.com/index.php/projects/simple-skype-voip-analog-adapter/

now the problem is in my place this center tapped transformer is not available.so i went for resistor based circuit.it worked but the in/out going sound levels r very low.so is it possible for any improvement in this ckt.
is amplification of sound levels  possible?

can u modify the circuit for better performance.
thanks

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