GB506765A - Improvements in or relating to amplifiers for electrical signalling systems - Google Patents

Improvements in or relating to amplifiers for electrical signalling systems

Info

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
Application number
GB3355737A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3355737A priority Critical patent/GB506765A/en
Publication of GB506765A publication Critical patent/GB506765A/en
Expired legal-status Critical Current

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.
GB3355737A 1937-12-03 1937-12-03 Improvements in or relating to amplifiers for electrical signalling systems Expired GB506765A (en)

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)

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