GB914254A - Improvements in or relating to apparatus for generating sawtooth currents - Google Patents

Improvements in or relating to apparatus for generating sawtooth currents

Info

Publication number
GB914254A
GB914254A GB738559A GB738559A GB914254A GB 914254 A GB914254 A GB 914254A GB 738559 A GB738559 A GB 738559A GB 738559 A GB738559 A GB 738559A GB 914254 A GB914254 A GB 914254A
Authority
GB
United Kingdom
Prior art keywords
circuit
feedback
saw
amplifier
adding network
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
GB738559A
Inventor
Francis Douglas Bate
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB738559A priority Critical patent/GB914254A/en
Priority to FR820113A priority patent/FR1249706A/en
Publication of GB914254A publication Critical patent/GB914254A/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)

Abstract

914,254. Valve and transistor saw-tooth generating circuits. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Feb. 19, 1960 [March 3, 1959], No. 7385/59. Class 40 (6). A saw-tooth generator is coupled to an amplifier via an adding network, the waveform being linearized by feedback via a differenting and an integrating circuit to the other input of the adding network. The Specification describes frame deflection circuits for television receivers. In Fig. 1, the capacitor C 1 is charged via resistor R 1 and repetitively discharged by means of the oscillator V 1 . The saw-tooth wave so produced is fed via the left-hand part of potentiometer R 2 to the grid of the amplifier V 2 and thence via transformer T to the deflection coil SC. The effect of the inductance of transformer T on the linearity is minimized by a negative feedback circuit comprising a differentiating circuit C 4 , R 4 and an integrating circuit R 3 , C 3 , the latter circuit reducing the amplitude of flyback pulse fed back. The amount of feedback and hence the scan amplitude is controlled by variation of potentiometer R 2 , which acts as an adding network. Resistor R 3 . may also be variable. Fig. 2 shows a similar circuit using a transistor amplifier TS in which the base bias is derived from a potential divider R 7 , R 8 . The use of isolating resistors for feedback and input paths prevents faulty interlacing due to unwanted line pulses being fed back from the output circuit to the frame oscillator V 1 . Specification 479,113 is referred to.
GB738559A 1959-03-03 1959-03-03 Improvements in or relating to apparatus for generating sawtooth currents Expired GB914254A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB738559A GB914254A (en) 1959-03-03 1959-03-03 Improvements in or relating to apparatus for generating sawtooth currents
FR820113A FR1249706A (en) 1959-03-03 1960-03-02 Sawtooth oscillation generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB738559A GB914254A (en) 1959-03-03 1959-03-03 Improvements in or relating to apparatus for generating sawtooth currents

Publications (1)

Publication Number Publication Date
GB914254A true GB914254A (en) 1963-01-02

Family

ID=9832114

Family Applications (1)

Application Number Title Priority Date Filing Date
GB738559A Expired GB914254A (en) 1959-03-03 1959-03-03 Improvements in or relating to apparatus for generating sawtooth currents

Country Status (1)

Country Link
GB (1) GB914254A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678332A (en) * 1969-03-20 1972-07-18 Philips Corp Circuit arrangement for adjusting the linearity of the deflection signal generated for a deflection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678332A (en) * 1969-03-20 1972-07-18 Philips Corp Circuit arrangement for adjusting the linearity of the deflection signal generated for a deflection system

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