Condenser microphone

A condenser microphone comprising:

• a condenser microphone unit having a diaphragm and a fixed electrode disposed opposite to the diaphragm;
• a field effect transistor serving as an impedance converter;
• and
• a transistor to generate operational power for the field effect transistor, wherein
• the field effect transistor comprises a gate, a source and a drain,
• the gate is connected to the fixed electrode or the diaphragm;
• the diaphragm disposed opposite to the fixed electrode connected to the gate or the fixed electrode disposed opposite to the diaphragm connected to the gate is grounded;
• the source is connected to a base of the transistor;
• the drain is connected to an emitter of the transistor,
• a resistor establishing a base potential of the transistor is disposed between the base of the transistor and a ground,
• output signals of the condenser microphone unit are extracted through a two wire system from the drain of the field effect transistor, and
• a forward drop voltage between the base and the emitter of the transistor serves as an operational power for the field effect transistor, the operational power being a drain-source voltage of the field effect transistor.