Sunday 7 May 2017

frequency - Building a telephone spy


I am implementing the following circuit


enter image description here


but I am stuck at one point.


How can we input the wires in IN1 , IN2, OUT1, OUT2? I don't know which wire to insert because there are almost 4 or 5 wires inside the telephone wire. So which wire should I insert in the respective areas?



And is there any alternative for the antenna because it is short in market. :)




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