JPS57121305A - Muting circuit - Google Patents
Muting circuitInfo
- Publication number
- JPS57121305A JPS57121305A JP56005866A JP586681A JPS57121305A JP S57121305 A JPS57121305 A JP S57121305A JP 56005866 A JP56005866 A JP 56005866A JP 586681 A JP586681 A JP 586681A JP S57121305 A JPS57121305 A JP S57121305A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- constant current
- series
- turned
- voltage
- 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.)
- Granted
Links
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
Abstract
PURPOSE: To give the amplifying function to a muting circuit, by controlling current values of the first and the second constant current circuits, which are connected in series, by a control means where a parallel circuit consisting of a voltage element and a by-pass circuit is connected in series to the third constant current circuit.
CONSTITUTION: The first and the second constant current circuits 3 and 8 and the first and the second diodes 4 and 7 are connected in series to form a bias circuit. Emitters of the first and the second transistors (TR) 9 and 15 which obtain inputs from the bias circuit are connected mutually to form a current amplifying circuit. Further, a parallel circuit of constant voltage elements 18∼ 22 and a by-pass circuit 24 is connected in series to the third constant current circuit 23. When a switch 30 is opened, the by-pass circuit 24 is turned off, and the third constant current circuit 23 is turned on, and currents are flowed to the first and the second constant current circuits 3 and 8, and the output signal of a voltage amplifying part 2 is amplified by the first and the second TRs 9 and 15. When the switch 30 is closed, diodes 4 and 7 and TRs 9 and 12 are turned off, and the output of the voltage amplifying part 2 is cut off completely.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56005866A JPS57121305A (en) | 1981-01-20 | 1981-01-20 | Muting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56005866A JPS57121305A (en) | 1981-01-20 | 1981-01-20 | Muting circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57121305A true JPS57121305A (en) | 1982-07-28 |
JPH0345566B2 JPH0345566B2 (en) | 1991-07-11 |
Family
ID=11622869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56005866A Granted JPS57121305A (en) | 1981-01-20 | 1981-01-20 | Muting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57121305A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55133110A (en) * | 1979-04-04 | 1980-10-16 | Pioneer Electronic Corp | Integrated circuit device |
JPS55156405A (en) * | 1979-05-25 | 1980-12-05 | Hitachi Ltd | Acoustic amplifying output circuit |
-
1981
- 1981-01-20 JP JP56005866A patent/JPS57121305A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55133110A (en) * | 1979-04-04 | 1980-10-16 | Pioneer Electronic Corp | Integrated circuit device |
JPS55156405A (en) * | 1979-05-25 | 1980-12-05 | Hitachi Ltd | Acoustic amplifying output circuit |
Also Published As
Publication number | Publication date |
---|---|
JPH0345566B2 (en) | 1991-07-11 |
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