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Title:
EARPHONE DETECTING CIRCUIT
Document Type and Number:
Japanese Patent JP3717865
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide an earphone detecting circuit which does not have a capacitor.
SOLUTION: In the earphone detecting circuit provided with a transistor, a first resistor, a second resistor, a third resistor and a detector, the transistor has a first terminal, a second terminal, a third terminal and a fourth terminal. The first and fourth terminals of the transistor are electrically connected to an operating voltage. One terminal of the first resistor is electrically connected to the first terminal of the transistor, and the other terminal of the first resistor is electrically connected to the second terminal of the transistor. One terminal of the second resistor is electrically connected to the third terminal of the transistor, and the other terminal is electrically connected to a ground terminal. One terminal of the third resistor is electrically connected to the second terminal of the transistor, and the other terminal is electrically connected to a detecting terminal of an earphone drive circuit. One terminal of the capacitor is electrically connected to the second terminal of the transistor, and the other terminal is electrically connected to the ground terminal. The detector is electrically connected to the third terminal of the transistor.


Inventors:
Liang exhibition
Application Number:
JP2002131701A
Publication Date:
November 16, 2005
Filing Date:
May 07, 2002
Export Citation:
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Assignee:
Hongda International Electronics Co., Ltd.
International Classes:
H04R1/10; H03K17/00; H04R3/00; H04R3/12; H04R5/04; (IPC1-7): H04R1/10; H04R3/12; H04R5/04
Domestic Patent References:
JP11136784A
JP1066188A
JP9307990A
Attorney, Agent or Firm:
Shogo Ehara
Hideka Tanaka
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano
Hiroaki Yamane