Abstract: A wireless microphone includes a circuit board mounted in a housing, and a common conductor pair mounted on the circuit board. Impedance coils and isolation capacitors are provided to interconnect a charger circuit and a transmitter circuit to the common conductor pair such that, when a direct current power signal is supplied to the common conductor pair, the power signal will be prevented from reaching the transmitter circuit and will be directed to the charger circuit and such that, when the transmitter circuit outputs a microphone pick-up signal for transmission, the microphone pick-up signal will be prevented from reaching the charger circuit and will be directed to the common conductor pair for wireless transmission thereby.