Condenser microphone

Details Condenser microphone Condenser microphone

2006-06-16

2010-12-07

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

C381S122000, C381S111000

Reexamination Certificate

active

07848532

ABSTRACT:
To operate from any of phantom power sources of 12 V, 24 V and 48 V and secure a maximum output level according to each of the power sources. A condenser microphone including a microphone unit MU containing a diaphragm and a fixed pole, an FET Q1of a built-in bias circuit type for operating as an impedance converter of the microphone unit MU and an output transformer TRS connected to a phantom power source with a midpoint of a primary winding of the output transformer TRS connected to a drain of the FET Q1via a constant current diode D2, and a transistor Q2of an emitter follower for current amplification connected between a source of the FET Q1and a secondary winding of the output transformer TRS, wherein a diode D3is connected between the source of the FET Q1and a base of the transistor Q2to have an anode thereof on the source side of the FET Q1so as to provide forward voltage generated by the diode D3to the base of the transistor Q2.

REFERENCES:
patent: 4567608 (1986-01-01), Watson et al.
patent: 6549632 (2003-04-01), Akino et al.
patent: 2002/0186855 (2002-12-01), Akino et al.
patent: H03-201608 (1991-09-01), None
patent: 6-52300 (1994-07-01), None
patent: 2001-111361 (2001-04-01), None

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