This is a wireless microphone circuit which transmits the FM frequency and uses a coil on the printed circuit board itself. This transmitter has a good frequency stability, its sensitivity is excellent and audio consumption is about 30mA. The size of the PCI board is 25mm by 50mm.The power supply is made by a 9V battery. and its range can be more than 100 meters.
FM Wireless Microphone with Coil PCI Circuit Diagram
To improve the transfer transistor 2N2222 use in place of BC547.You have to remove the 4K7 resistor if you use a dynamic type microphone.
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