GB506765A - Improvements in or relating to amplifiers for electrical signalling systems - Google Patents
Improvements in or relating to amplifiers for electrical signalling systemsInfo
- Publication number
- GB506765A GB506765A GB3355737A GB3355737A GB506765A GB 506765 A GB506765 A GB 506765A GB 3355737 A GB3355737 A GB 3355737A GB 3355737 A GB3355737 A GB 3355737A GB 506765 A GB506765 A GB 506765A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- resistance
- feedback path
- potentiometer
- amplifiers
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
- H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
- H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes
- H03G9/06—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control
- H03G9/08—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control incorporating negative feedback
Landscapes
- Control Of Voltage And Current In General (AREA)
Abstract
506,765. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., and'ROCHE, A. H. Dec. 3, 1937, No. 33557. [Class 40 (v)] The negative feedback applied to the grid of an amplifier is obtained from a tapping on a reactive potentiometer shunted across the feedback path and having an impedance large compared with the impedance presented to it by the feedback path. The Figure shows a bridge R0, R1, R2, R3 associated with the output and a resistance R4 across the feedback path in parallel with the control potentiometer comprising impedance Z and resistance R5. If the impedance presented by the output bridge to the feedback path is small compared with the impedance of the potentiometer the resistance R4 may be dispensed with. The control affects both gain and frequency and resistance R5 may be varied either manually or automatically.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3355737A GB506765A (en) | 1937-12-03 | 1937-12-03 | Improvements in or relating to amplifiers for electrical signalling systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3355737A GB506765A (en) | 1937-12-03 | 1937-12-03 | Improvements in or relating to amplifiers for electrical signalling systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB506765A true GB506765A (en) | 1939-06-05 |
Family
ID=10354484
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3355737A Expired GB506765A (en) | 1937-12-03 | 1937-12-03 | Improvements in or relating to amplifiers for electrical signalling systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB506765A (en) |
-
1937
- 1937-12-03 GB GB3355737A patent/GB506765A/en not_active Expired
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