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GB558163A - Improvements in or relating to electrical relaxation oscillators - Google Patents

Improvements in or relating to electrical relaxation oscillators

Info

Publication number
GB558163A
GB558163A GB8438/42A GB843842A GB558163A GB 558163 A GB558163 A GB 558163A GB 8438/42 A GB8438/42 A GB 8438/42A GB 843842 A GB843842 A GB 843842A GB 558163 A GB558163 A GB 558163A
Authority
GB
United Kingdom
Prior art keywords
resistance
thermistor
potentiometer
condenser
scanning
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
GB8438/42A
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.)
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 GB8438/42A priority Critical patent/GB558163A/en
Priority to US490284A priority patent/US2426179A/en
Publication of GB558163A publication Critical patent/GB558163A/en
Priority to FR939098D priority patent/FR939098A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
    • H03K6/02—Amplifying pulses

Landscapes

  • Control Of Temperature (AREA)
  • Thermistors And Varistors (AREA)

Abstract

558,163. Valve generating circuits. STANDARD TELEPHONES & CABLES, Ltd., CHATTERJEA, P. K., and AMBROSE, D. M. June 19, 1942, No. 8438. [Class 40 (v)] The curvature of the scanning or slow stroke of the saw-tooth wave generated by a relaxation oscillator is compensated by the provision of a resistance potentiometer in the coupling between the generating and amplifying stages, the potentiometer including a thermistor, or thermally sensitive resistance element, adapted to change its resistance progressively in the same direction during each scanning stroke. The Figure shows a gas discharge tube V1 arranged to discharge condenser C1 charged through resistance R1. The voltage applied to the amplifier V2 is modified by the potentiometer formed by resistance R5 and thermistor T so as to compensate the curvature due to the decrease in the charging rate of condenser C1 as this becomes charged. As shown, a thermistor with a positive temperature co-efficient is used but a thermistor with a negative temperature coefficient may be used if interchanged with the resistance R5. The invention is also applicable to other forms of relaxation oscilators.
GB8438/42A 1942-06-19 1942-06-19 Improvements in or relating to electrical relaxation oscillators Expired GB558163A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB8438/42A GB558163A (en) 1942-06-19 1942-06-19 Improvements in or relating to electrical relaxation oscillators
US490284A US2426179A (en) 1942-06-19 1943-06-10 Electrical relaxation oscillator
FR939098D FR939098A (en) 1942-06-19 1946-04-01 Improvements to electric relaxation oscillators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8438/42A GB558163A (en) 1942-06-19 1942-06-19 Improvements in or relating to electrical relaxation oscillators

Publications (1)

Publication Number Publication Date
GB558163A true GB558163A (en) 1943-12-23

Family

ID=9852490

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8438/42A Expired GB558163A (en) 1942-06-19 1942-06-19 Improvements in or relating to electrical relaxation oscillators

Country Status (3)

Country Link
US (1) US2426179A (en)
FR (1) FR939098A (en)
GB (1) GB558163A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467285A (en) * 1944-07-12 1949-04-12 Rca Corp High-frequency generating system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578525A (en) * 1946-02-06 1951-12-11 Marcellus S Merrill Electronic control
US2522492A (en) * 1946-05-29 1950-09-19 Crystal Res Lab Inc Electronic metronome
BE505708A (en) * 1950-09-08

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1934322A (en) * 1932-06-10 1933-11-07 Westinghouse Electric & Mfg Co Cathode ray oscilloscope
GB424429A (en) * 1932-08-30 1935-02-21 Loewe Opta Gmbh Oscillation generators for scanning in television and like systems
US2105177A (en) * 1934-03-29 1938-01-11 Cfcmug Device for controlling cathode beams
CH187275A (en) * 1935-03-29 1936-10-31 Loewe Opta Gmbh Raster device for television receivers.
BE414841A (en) * 1935-04-18
US2221665A (en) * 1938-08-26 1940-11-12 Hazeltine Corp Periodic wave generator
US2280527A (en) * 1940-09-07 1942-04-21 Rca Corp Oscillator drift compensation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467285A (en) * 1944-07-12 1949-04-12 Rca Corp High-frequency generating system

Also Published As

Publication number Publication date
US2426179A (en) 1947-08-26
FR939098A (en) 1948-11-03

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