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GB639531A - Improvements in scanning circuits for television receivers - Google Patents

Improvements in scanning circuits for television receivers

Info

Publication number
GB639531A
GB639531A GB1883439A GB1883439A GB639531A GB 639531 A GB639531 A GB 639531A GB 1883439 A GB1883439 A GB 1883439A GB 1883439 A GB1883439 A GB 1883439A GB 639531 A GB639531 A GB 639531A
Authority
GB
United Kingdom
Prior art keywords
output valve
grid
condenser
anode
potentiometer
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
GB1883439A
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.)
GEORGE FREDERICK HAWKINS
Murphy Radio Ltd
Original Assignee
GEORGE FREDERICK HAWKINS
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 GEORGE FREDERICK HAWKINS, Murphy Radio Ltd filed Critical GEORGE FREDERICK HAWKINS
Priority to GB1883439A priority Critical patent/GB639531A/en
Publication of GB639531A publication Critical patent/GB639531A/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
    • H03K4/39—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 an amplifier
    • H03K4/43—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 an amplifier combined with means for generating the driving pulses

Landscapes

  • Details Of Television Scanning (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

639,531. Sawtooth generating circuits. MURPHY RADIO, Ltd., and HAWKINS, G. F. June 28, 1939, No. 18834. [Class 40 (vi)] In an electro-magnetic scanning circuit the internal impedance of the output valve is caused to have such a value that it can be used to damp out the unwanted high-frequency oscillations which would otherwise occur during the fly-back period of the saw-tooth. The impedance of a high impedance output valve is reduced by injecting into the grid circuit a voltage proportional to and in phase with its anode voltage by means of a small condenser connected between anode and control-grid, or by injecting a voltage derived from an auxiliary winding on the output transformer or from a potentiometer in shunt with the coils. In Fig. 2 the added condenser 13 in series with the grid coupling condenser 8 and the condersers 18 and 16 in the sawtooth generating circuit, together with the decoupling condenser 5, form a capacitive potentiometer between the anode of the output valve and H.T. negative. The grid of the output valve is tapped on to this potentiometer and the values of the capacities are, chosen to give the correct amount of negative feedback so that the output valve has the necessary internal impedance for damping during the fly-back period. The internal anode-to-grid capacity of the output valve may be of such a value that the addition of condenser 13 is unnecessary and the gain of the output stage may be adjusted by varying resistor 14. Specification 511,600 is referred to.
GB1883439A 1939-06-28 1939-06-28 Improvements in scanning circuits for television receivers Expired GB639531A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1883439A GB639531A (en) 1939-06-28 1939-06-28 Improvements in scanning circuits for television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1883439A GB639531A (en) 1939-06-28 1939-06-28 Improvements in scanning circuits for television receivers

Publications (1)

Publication Number Publication Date
GB639531A true GB639531A (en) 1950-06-28

Family

ID=10119200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1883439A Expired GB639531A (en) 1939-06-28 1939-06-28 Improvements in scanning circuits for television receivers

Country Status (1)

Country Link
GB (1) GB639531A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851632A (en) * 1954-03-27 1958-09-09 Philips Corp Circuit for producing sawtooth currents in the vertical deflection coils of television receivers
US2961608A (en) * 1956-06-20 1960-11-22 Gen Electric High voltage sawtooth wave generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851632A (en) * 1954-03-27 1958-09-09 Philips Corp Circuit for producing sawtooth currents in the vertical deflection coils of television receivers
US2961608A (en) * 1956-06-20 1960-11-22 Gen Electric High voltage sawtooth wave generator

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