JPS5769912A - Amplifier for microphone device - Google Patents
Amplifier for microphone deviceInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007158629A (en) * | 2005-12-02 | 2007-06-21 | New Japan Radio Co Ltd | Microphone amplifier |
-
1980
- 1980-10-21 JP JP14784780A patent/JPS5769912A/en active Pending
Cited By (1)
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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