GB485934A - Improvements in or relating to time-base circuits using thermionic valves - Google Patents

Improvements in or relating to time-base circuits using thermionic valves

Info

Publication number
GB485934A
GB485934A GB3243736A GB3243736A GB485934A GB 485934 A GB485934 A GB 485934A GB 3243736 A GB3243736 A GB 3243736A GB 3243736 A GB3243736 A GB 3243736A GB 485934 A GB485934 A GB 485934A
Authority
GB
United Kingdom
Prior art keywords
valve
condenser
grid
period
sweep
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
GB3243736A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB3243736A priority Critical patent/GB485934A/en
Priority to FR829838D priority patent/FR829838A/en
Publication of GB485934A publication Critical patent/GB485934A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
    • H03K4/12—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth voltage is produced across a capacitor

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

485,934. Valve generating circuits. BRITISH THOMSON-HOUSTON CO., Ltd., and MYNALL, D. J. Nov. 26, 1936, No. 32437. [Class 40 (v)] In a condenser relaxation circuit in which a valve, through which the condenser is discharged, is maintained non-conductive during the charging period by a second valve, a parallel-tuned resonant circuit is connected in series or parallel with the second valve to initiate the discharge through the first valve and to assist in restoring the circuit to normal. A triode and a pentode are used in the embodiments described but two triodes or a single triode-pentode could be used. The condenser 2 is normally charged over 3, the valve 1 being non-conductive due to negative bias on its grid which is maintained by the current flow through valve 5. Towards the end of the desired period the grid potential tends rapidly towards positive as described later and anode current flows. This raises the cathode potentials of both valves, reducing the flow through valve 5 and still further increasing it through valve 1, so that condenser 2 is rapidly discharged. The rapid rise in the flow through valve 1 is stopped when grid current is taken from condenser 9 which in turn takes it from the supply through resistance 8. When condenser 2 is fully discharged valve 1 cuts off and the resonant circuit 6, 7 which is tuned to a frequency between the sweep frequency and half the sweep frequency, receives a sharp rise of current and begins to oscillate substantially undamped. The effect of this oscillation is that the grid of valve 1 is first forced further negative, the negative tendency lasting until about half-way through the sweep period when it tends positively. Towards the end of the sweep period this positive tendency becomes rapid and another flyback is initiated, the above cycle then repeating. Synchronizing pulses may be injected by magnetic coupling into inductor 6. A modification in which the resonant circuit is connected in series with the grid resistance 10 is also described.
GB3243736A 1936-11-26 1936-11-26 Improvements in or relating to time-base circuits using thermionic valves Expired GB485934A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3243736A GB485934A (en) 1936-11-26 1936-11-26 Improvements in or relating to time-base circuits using thermionic valves
FR829838D FR829838A (en) 1936-11-26 1937-11-24 Improvements to television circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3243736A GB485934A (en) 1936-11-26 1936-11-26 Improvements in or relating to time-base circuits using thermionic valves

Publications (1)

Publication Number Publication Date
GB485934A true GB485934A (en) 1938-05-26

Family

ID=10338586

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3243736A Expired GB485934A (en) 1936-11-26 1936-11-26 Improvements in or relating to time-base circuits using thermionic valves

Country Status (2)

Country Link
FR (1) FR829838A (en)
GB (1) GB485934A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444084A (en) * 1943-06-21 1948-06-29 Rca Corp Resistance-capacitance oscillator
US2461120A (en) * 1944-11-02 1949-02-08 Hazeltine Research Inc Signal generator
US2515271A (en) * 1945-04-28 1950-07-18 Jr Carl H Smith Multivibrator count down circuits
US2553165A (en) * 1946-02-28 1951-05-15 Rca Corp Relaxation oscillator
US2553752A (en) * 1947-04-15 1951-05-22 Bell Telephone Labor Inc Combined multivibrator and sweep circuit
US2589240A (en) * 1945-04-07 1952-03-18 William E Frye Double pulse generator
US2610298A (en) * 1947-12-26 1952-09-09 Gen Electric Stabilized saw tooth oscillator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444084A (en) * 1943-06-21 1948-06-29 Rca Corp Resistance-capacitance oscillator
US2461120A (en) * 1944-11-02 1949-02-08 Hazeltine Research Inc Signal generator
US2589240A (en) * 1945-04-07 1952-03-18 William E Frye Double pulse generator
US2515271A (en) * 1945-04-28 1950-07-18 Jr Carl H Smith Multivibrator count down circuits
US2553165A (en) * 1946-02-28 1951-05-15 Rca Corp Relaxation oscillator
US2553752A (en) * 1947-04-15 1951-05-22 Bell Telephone Labor Inc Combined multivibrator and sweep circuit
US2610298A (en) * 1947-12-26 1952-09-09 Gen Electric Stabilized saw tooth oscillator

Also Published As

Publication number Publication date
FR829838A (en) 1938-07-07

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