GB643993A - Improvements in sawtooth current generators - Google Patents

Improvements in sawtooth current generators

Info

Publication number
GB643993A
GB643993A GB92647A GB92647A GB643993A GB 643993 A GB643993 A GB 643993A GB 92647 A GB92647 A GB 92647A GB 92647 A GB92647 A GB 92647A GB 643993 A GB643993 A GB 643993A
Authority
GB
United Kingdom
Prior art keywords
screen
grid
transformer
scan
circuit
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
GB92647A
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.)
HAROLD ALFRED FAIRHURST
Murphy Radio Ltd
Original Assignee
HAROLD ALFRED FAIRHURST
Murphy Radio 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 HAROLD ALFRED FAIRHURST, Murphy Radio Ltd filed Critical HAROLD ALFRED FAIRHURST
Priority to GB92647A priority Critical patent/GB643993A/en
Publication of GB643993A publication Critical patent/GB643993A/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
    • H03K4/26—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 current is produced through an inductor
    • H03K4/28—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 current is produced through an inductor using a tube operating as a switching device
    • H03K4/32—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 current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses
    • H03K4/34—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 current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses using a single tube with positive feedback through a transformer

Landscapes

  • Details Of Television Scanning (AREA)

Abstract

643,993. Saw-tooth generating circuits. MURPHY RADIO, Ltd., and FAIRHURST, H. A. Jan. 10, 1947, No. 926. [Class 40 (vi)] In a circuit for generating a deflecting magnetic field, a pentode 1 is arranged with its anode coupled by a step-down transformer 2, 4 to the screen grid, a correcting voltage being supplied to the suppressor grid from the screen. The flux variation in the transformer may be used to deflect a C.R. tube beam directly by making a suitable gap in the core, or deflecting coils associated with the tube may be connected to a tertiary winding on the transformer. Frequency and amplitude control are respectively effected by varying a resistor 13 in the screen circuit, which determines the rate of change of screen current during the scan, and the mean anode voltage. Distortion due to the impracticability of making the transformer winding reactances high compared with their reactances at frame frequency is compensated for by feeding a potential proportional to the integral of the screen current derived from the potentials across potentiometer 15 to the suppressor grid, producing compensation in the manner described in Specification 511,600. As this method of linearizing is not effective at the beginning of the scan a resistor 17 and capacitor 18 are also connected in the suppresor grid circuit so as to linearize this part of the scan. Synchronizing pulses are applied to the control grid of the valve,
GB92647A 1947-01-10 1947-01-10 Improvements in sawtooth current generators Expired GB643993A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB92647A GB643993A (en) 1947-01-10 1947-01-10 Improvements in sawtooth current generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB92647A GB643993A (en) 1947-01-10 1947-01-10 Improvements in sawtooth current generators

Publications (1)

Publication Number Publication Date
GB643993A true GB643993A (en) 1950-10-04

Family

ID=9712945

Family Applications (1)

Application Number Title Priority Date Filing Date
GB92647A Expired GB643993A (en) 1947-01-10 1947-01-10 Improvements in sawtooth current generators

Country Status (1)

Country Link
GB (1) GB643993A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841744A (en) * 1955-07-08 1958-07-01 Rca Corp Synchronized low frequency sawtooth current wave generating circuits
US3388286A (en) * 1964-10-19 1968-06-11 Rca Corp Vertical deflection circuit utilizing a single multi-electrode electron discharge device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2841744A (en) * 1955-07-08 1958-07-01 Rca Corp Synchronized low frequency sawtooth current wave generating circuits
US3388286A (en) * 1964-10-19 1968-06-11 Rca Corp Vertical deflection circuit utilizing a single multi-electrode electron discharge device

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