JPS57171811A - Variable attenuating circuit - Google Patents
Variable attenuating circuitInfo
- Publication number
- JPS57171811A JPS57171811A JP5739881A JP5739881A JPS57171811A JP S57171811 A JPS57171811 A JP S57171811A JP 5739881 A JP5739881 A JP 5739881A JP 5739881 A JP5739881 A JP 5739881A JP S57171811 A JPS57171811 A JP S57171811A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- inputted
- collector
- output
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
- H03G1/0082—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using bipolar transistor-type devices
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To obtain a variable attenuating circuit which generates a distortion- free output by cascading a variable attenuator which divides the voltage of an input audio signal by a resistance and the emitter-collector resistance of a transistor (TR), and inserting an amplifying circuit having a -1 grain. CONSTITUTION:An input audio signal is inputted to an attenuating circuit A1 and then supplied to an attenuating circuit A2 through an amplifying circuit 9 having a -1 gain, outputting a signal whose attenuation amount is varied. The signal inputted to the circuit A1 is connected to the collector of a TR8 through a capacitor 5 for DC component removal and a series resistance 7, and its voltage division output is led out through a capacitor 6 for DC component removal. Further, the characteristics of the circuit A2 are set equal to those of the circuit A1. The mitter-collector resistances of TRs 8 and 13 are varied by controlling their base currents by a control signal. Thus, the output of the circuit A1 is inverted and inputted to the circuit A2 to obtain a distortion-free output without reference to the polarity of the input signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5739881A JPS57171811A (en) | 1981-04-15 | 1981-04-15 | Variable attenuating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5739881A JPS57171811A (en) | 1981-04-15 | 1981-04-15 | Variable attenuating circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57171811A true JPS57171811A (en) | 1982-10-22 |
Family
ID=13054522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5739881A Pending JPS57171811A (en) | 1981-04-15 | 1981-04-15 | Variable attenuating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57171811A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018011281A (en) * | 2016-07-11 | 2018-01-18 | 正仁 櫨田 | Volume circuit without mechanical drive part linearly heard on audibility |
-
1981
- 1981-04-15 JP JP5739881A patent/JPS57171811A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018011281A (en) * | 2016-07-11 | 2018-01-18 | 正仁 櫨田 | Volume circuit without mechanical drive part linearly heard on audibility |
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