GB558757A - Improvements in or relating to volume control in electric transmission circuits - Google Patents

Improvements in or relating to volume control in electric transmission circuits

Info

Publication number
GB558757A
GB558757A GB9958/42A GB995842A GB558757A GB 558757 A GB558757 A GB 558757A GB 9958/42 A GB9958/42 A GB 9958/42A GB 995842 A GB995842 A GB 995842A GB 558757 A GB558757 A GB 558757A
Authority
GB
United Kingdom
Prior art keywords
thermistor
control
resistance
volume control
relating
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
GB9958/42A
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.)
LESLLE WILFRED HOUGHTON
STC PLC
Original Assignee
LESLLE WILFRED HOUGHTON
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 LESLLE WILFRED HOUGHTON, Standard Telephone and Cables PLC filed Critical LESLLE WILFRED HOUGHTON
Publication of GB558757A publication Critical patent/GB558757A/en
Expired legal-status Critical Current

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
    • H03G1/0041—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using thermistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/24—Frequency- independent attenuators

Landscapes

  • Control Of Temperature (AREA)

Abstract

558,757. Volume control. STANDARD TELEPHONES & CABLES, Ltd., CHATTERJEA, P. K., and HOUGHTON, L. W. July 17, 1942, No. 9958. [Class 40 (iv)] [Also in Group XL] An inter-valve coupling for volume control comprises a potentiometer consisting of a constant resistance and a thermistor, or thermally sensitive resistance element, and control is effected by varying the heating current applied to the thermistor. The Figure shows an arrangement using a negative temperature-coefficient thermistor T the heating of which is controlled by an adjustable resistance R2 from a source S and associated with a resistance R1. The resistance R1 and the thermistor T may be interchanged and the latter may have a positive temperature-coefficient. The control is particularly applicable to very high frequencies as the element in the thermistor may be of small dimension, e.g..02 inch in diameter, and may be located in the circuit at the best point for transmission. The control is also convenient in the case of high voltage apparatus, e.g. television, when suitable insulation may be provided by using a transformer with the control element at earth potential.
GB9958/42A 1942-07-17 1942-07-17 Improvements in or relating to volume control in electric transmission circuits Expired GB558757A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB246140X 1942-07-17

Publications (1)

Publication Number Publication Date
GB558757A true GB558757A (en) 1944-01-19

Family

ID=10214437

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9958/42A Expired GB558757A (en) 1942-07-17 1942-07-17 Improvements in or relating to volume control in electric transmission circuits

Country Status (4)

Country Link
BE (1) BE469503A (en)
CH (1) CH246140A (en)
FR (1) FR932708A (en)
GB (1) GB558757A (en)

Also Published As

Publication number Publication date
CH246140A (en) 1946-12-15
BE469503A (en)
FR932708A (en) 1948-03-31

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