The function of the circuit while listening to (Figure 2) to see the effects of changes in IL that flows through the phone line winding N1 and another Transmitter and a stream of flowing through the coils and IL2 N2 ZN, with separate flow to the flow of IL3 winding N3 and IL, which flow from the results of the Receiver is greater than any other result in loop current induced IN2 the winding current and the induced IL3 N2 winding N3 consider this to see that the flow of current in the loop in two parts with the flow direction in the same way IN2 and IN3 flow through is the Receiver, thus causing the voltage to fall across the more can be seen from equation (IN2 + IN3), so this is a cycle, ZRX raised the level of the signal, a strong signal that a quality listen.
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