The operation of the circuit while listening (Figure 2) reveals that the effect of changes in the current line phones IL which flows through the coil N1 and Transmitter and also the other parts IL2 flows through the coil N2 and ZN there are currents IL3. Separate flow to the coils N3 and Receiver of the current IL which is greater than the loop so the resulting induced current IN2 coil N2 and induced current IL3 coil N3 the flow in this loop to see that. The two streams are flowing in the same direction of the flow stream IN2 and IN3 via Receiver, thus causing the voltage across the greater. It can be seen from equation (IN2 + IN3) ZRX so this cycle raises the bar of signal strength, signal quality that makes listening well.
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