JPS57201309A - Voice amplifying circuit - Google Patents
Voice amplifying circuitInfo
- Publication number
- JPS57201309A JPS57201309A JP56086193A JP8619381A JPS57201309A JP S57201309 A JPS57201309 A JP S57201309A JP 56086193 A JP56086193 A JP 56086193A JP 8619381 A JP8619381 A JP 8619381A JP S57201309 A JPS57201309 A JP S57201309A
- Authority
- JP
- Japan
- Prior art keywords
- output circuit
- electric current
- transistor
- circuit
- bias
- 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
- Amplifiers (AREA)
Abstract
PURPOSE: To stop the operation of the output circuit of a titled voice amplifying circuit, by breaking the supply of the driving electric current to the output circuit without inserting any power supply switch to be connected to the output circuit.
CONSTITUTION: Under the normal condition, an outside controlling terminal 100 is under floating condition, and an output circuit 50 receives a bias electric current from a bias circuit 30 and amplifies input signals. When the outside controlling terminal 100 is set to a voltage which is lower than the threshold voltage between the base and emitter of a transistor 35, the transistor 35 is cut off and does not supply any electric current to a diode 34 and a transistor 36. That is to say, no bias electric current is supplied to the output circuit 50 and output transistors 51, 54, and 55 are cut off, and, therefore, no voice amplification is performed.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56086193A JPS57201309A (en) | 1981-06-04 | 1981-06-04 | Voice amplifying circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56086193A JPS57201309A (en) | 1981-06-04 | 1981-06-04 | Voice amplifying circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57201309A true JPS57201309A (en) | 1982-12-09 |
Family
ID=13879935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56086193A Pending JPS57201309A (en) | 1981-06-04 | 1981-06-04 | Voice amplifying circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57201309A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55156405A (en) * | 1979-05-25 | 1980-12-05 | Hitachi Ltd | Acoustic amplifying output circuit |
-
1981
- 1981-06-04 JP JP56086193A patent/JPS57201309A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55156405A (en) * | 1979-05-25 | 1980-12-05 | Hitachi Ltd | Acoustic amplifying output circuit |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS56104510A (en) | Electric power amplifier | |
JPS5753112A (en) | Sepp power amplifier | |
JPS57173220A (en) | Comparator circuit | |
JPS5753113A (en) | Push-pull amplifier | |
KR880010561A (en) | Voice Output Amplifier | |
EP0065346A3 (en) | Semiconductor switching device | |
JPS57201309A (en) | Voice amplifying circuit | |
CA2112203A1 (en) | Input Amplifier Circuit | |
EP0114319A3 (en) | Automatic gain control circuit | |
JPS56123111A (en) | Muting circuit | |
EP0312088A3 (en) | Sensitive thyristor having improved noise-capability | |
JPS55138927A (en) | Photo-coupling semiconductor switch device | |
JPS5555605A (en) | Protective circuit for power output circuit | |
JPS5753109A (en) | Protecting circuit for amplifier | |
JPS5780262A (en) | Circuit for protecting short-circuting of output terminal of stabilized power circuit | |
JPS5780829A (en) | Output protecting circuit device | |
JPS54161304A (en) | Amplifying device | |
JPS56134810A (en) | Class "b" push-pull output circuit | |
JPS57138205A (en) | Power amplifier | |
JPS54161867A (en) | Protective circuit | |
JPS56131227A (en) | Negative feedback circuit for reference voltage of da converter | |
JPS56104538A (en) | Switch circuit | |
JPS53147255A (en) | Current output circuit | |
JPS6465922A (en) | Semiconductor integrated circuit | |
JPS5631228A (en) | Tri-state output circuit |