Impedance converter and condenser microphone

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United States of America Patent

PATENT NO 9893691
SERIAL NO

15386174

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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In an impedance converter using an electron tube as an active element, output impedance can be made sufficiently low, and the number of circuit elements therefor is decreased and a circuit configuration therefor is made simple. Provided is an impedance converter having an electron tube cathode-follower connected. The impedance converter includes a bias diode that provides a bias voltage to a cathode of the electron tube, high resistance elements that provide a voltage of the bias diode to a grid of the electron tube, a load circuit connected to the electron tube, and a complementary emitter output circuit including two transistors, respective bases of which are connected to one end and the other end of the bias diode.

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Patent Owner(s)

  • KABUSHIKI KAISHA AUDIO-TECHNICA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Akino, Hiroshi Kanagawa, JP 274 1646

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