GB689180A - Improvements relating to circuits for the generation of sawtooth currents - Google Patents

Improvements relating to circuits for the generation of sawtooth currents

Info

Publication number
GB689180A
GB689180A GB3346249A GB3346249A GB689180A GB 689180 A GB689180 A GB 689180A GB 3346249 A GB3346249 A GB 3346249A GB 3346249 A GB3346249 A GB 3346249A GB 689180 A GB689180 A GB 689180A
Authority
GB
United Kingdom
Prior art keywords
valve
saw
voltage
amplitude
tooth
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
GB3346249A
Inventor
John Bruce Smith
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB3346249A priority Critical patent/GB689180A/en
Publication of GB689180A publication Critical patent/GB689180A/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)
  • Television Receiver Circuits (AREA)

Abstract

689,180. Pulse generating circuits. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Dec. 12, 1950 [Dec. 31, 1949], No. 33462/49. Class 40 (vi). [Also in Group XXXV] In a system for maintaining a saw-tooth current of constant amplitude in a load of variable impedance, a condenser is charged and discharged repeatedly to supply the load and the voltage to which it is charged is varied by a direct voltage dependent on the amplitude of the saw-tooth current. To maintain constant the amplitude of sawtooth current in a scanning coil 7 which is associated with a television tube and is supplied, through a transformer 6, with the output of a time-base amplifier valve 5, the volt-drop across a resistor 8 in series with the coil is, after rectification by a negatively biased diode 11, applied to an amplifier 12 controlling the H.T. voltage applied to a resistance-condenser network 2, 4 forming, with a valve 1, a saw-tooth voltage generator which drives amplifier valve 5 and is triggered by positive voltage pulses, from an external source (not shown), applied to the grid of valve 1. Resistor 8 may alternatively be in the primary circuit of transformer 6.
GB3346249A 1949-12-31 1949-12-31 Improvements relating to circuits for the generation of sawtooth currents Expired GB689180A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3346249A GB689180A (en) 1949-12-31 1949-12-31 Improvements relating to circuits for the generation of sawtooth currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3346249A GB689180A (en) 1949-12-31 1949-12-31 Improvements relating to circuits for the generation of sawtooth currents

Publications (1)

Publication Number Publication Date
GB689180A true GB689180A (en) 1953-03-25

Family

ID=10353277

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3346249A Expired GB689180A (en) 1949-12-31 1949-12-31 Improvements relating to circuits for the generation of sawtooth currents

Country Status (1)

Country Link
GB (1) GB689180A (en)

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