Title:
インピーダンス変換器
Document Type and Number:
Japanese Patent JP4227679
Kind Code:
B2
Abstract:
There is provided a preferable impedance converter for particularly to a condenser microphone having higher input impedance without being limited by a grid resistance, and suppressing the impedance converter including an amplifier tube 2 with plate-ground, and a bias circuit 1 for generating a bias voltage applied to a grid of the amplifier tube 2, said bias circuit 1 including a diode 1A for generating a bias voltage, and a diode 1B for applying the bias voltage to the grid and thereby flowing a current toward the grid of the amplifier tube 2 so that a ham noise and a variation of a bias can be suppressed.
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Inventors:
Hiroshi Akino
Application Number:
JP12439998A
Publication Date:
February 18, 2009
Filing Date:
May 07, 1998
Export Citation:
Assignee:
Audio Technica Co., Ltd.
International Classes:
H04R3/06; H03F1/30; H03F3/181
Domestic Patent References:
| JP6052300U | ||||
| JP7283661A | ||||
| JP47007279A |
Attorney, Agent or Firm:
Takuya Ohara
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