JPS5769912A - Amplifier for microphone device - Google Patents

Amplifier for microphone device

Info

Publication number
JPS5769912A
JPS5769912A JP14784780A JP14784780A JPS5769912A JP S5769912 A JPS5769912 A JP S5769912A JP 14784780 A JP14784780 A JP 14784780A JP 14784780 A JP14784780 A JP 14784780A JP S5769912 A JPS5769912 A JP S5769912A
Authority
JP
Japan
Prior art keywords
amplifier
gain
potential
constitution
output signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP14784780A
Other languages
Japanese (ja)
Inventor
Shinichi Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP14784780A priority Critical patent/JPS5769912A/en
Publication of JPS5769912A publication Critical patent/JPS5769912A/en
Pending legal-status Critical Current

Links

Landscapes

  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: To achieve broad operating range and stable gain, by controlling the operating point of an output stage transistor (TR) and gain independently through the provision of a differential amplifier at the prestage of a main amplifier and feedback loop to control the gain of main amplifier.
CONSTITUTION: The output signal of microphone 2 is amplified differentially, a collector current of a transistor (TR)3 is a base current of a TR1, and the TR1 takes a resistor (R)4 at the receiving end as a load. The gain to the AC component can be set to a desired value, by suitably selecting the values of R8, R9. On the other hand, as to DC, the operating point of the TR1 can be determind arbitrarily with the base potential of the TR3 through the distibution of R6, R7. Further, in a diode 9, the DC potential to the amplifier B is made higher than the potential at the collector of the TR1, the power voltage to the amplifier B is supplied through an R10, and a capacitor C8 by-passes the AC component. With this constitution, stable output over a wide range can be obtained by commonly using the power supply line of the amplifier and the output signal line.
COPYRIGHT: (C)1982,JPO&Japio
JP14784780A 1980-10-21 1980-10-21 Amplifier for microphone device Pending JPS5769912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14784780A JPS5769912A (en) 1980-10-21 1980-10-21 Amplifier for microphone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14784780A JPS5769912A (en) 1980-10-21 1980-10-21 Amplifier for microphone device

Publications (1)

Publication Number Publication Date
JPS5769912A true JPS5769912A (en) 1982-04-30

Family

ID=15439595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14784780A Pending JPS5769912A (en) 1980-10-21 1980-10-21 Amplifier for microphone device

Country Status (1)

Country Link
JP (1) JPS5769912A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007158629A (en) * 2005-12-02 2007-06-21 New Japan Radio Co Ltd Microphone amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007158629A (en) * 2005-12-02 2007-06-21 New Japan Radio Co Ltd Microphone amplifier

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