GB536453A - Improvements in or relating to time-base circuits - Google Patents

Improvements in or relating to time-base circuits

Info

Publication number
GB536453A
GB536453A GB3003639A GB3003639A GB536453A GB 536453 A GB536453 A GB 536453A GB 3003639 A GB3003639 A GB 3003639A GB 3003639 A GB3003639 A GB 3003639A GB 536453 A GB536453 A GB 536453A
Authority
GB
United Kingdom
Prior art keywords
potential
voltage
grid
condenser
screen
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
GB3003639A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE468741D priority Critical patent/BE468741A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3003639A priority patent/GB536453A/en
Publication of GB536453A publication Critical patent/GB536453A/en
Priority to FR933984D priority patent/FR933984A/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)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Details Of Television Scanning (AREA)

Abstract

536,453. Valve generating circuits. STANDARD TELEPHONES & CABLES, Ltd., SHANNON, D. S. B., and CHATTERJEA, P. K. Nov. 14, 1939, No. 30036. [Class 40 (v)] In a time base circuit, the linearity of the output is improved by varying the potential of the earthy condenser plate with respect to earth, this potential falling at a decreasing rate as the potential of the other plate rises during the charging period. The relaxation condenser C1 is in series with an auxiliary condenser C2, these being connected as shown to the screen grid SG, control grid CG, and secondary emitter SE of a valve V1, having a screen S to block the direct path between the cathode C and the secondary emitter. In operation, as the condenser Cl charges over resistance R1, the potential on the screen-grid SG rises ; at a certain point secondary emission from SE commences and increases rapidly when SG attains a critical potential. SE rapidly becomes positive, so that a positive potential is applied over C2 to the control grid CG, whose potential rises rapidly. The process is cumulative and primary and secondary currents increase, until the increase in the primary current lowers the potential of the screen-grid SG to a point at which condenser C1 discharges, the voltage across C1 being reversed since SE is at this instant positive. As SG falls below the critical value, emission from SE suddenly ceases, causing its potential to fall. This potential change is applied over C2 to the control grid CG, causing it to become negative and stop the primary current through the valve, thereby allowing C1 to recharge over R1. The cycle then repeats. Fig. 2A shows the sawtooth voltage produced at the screen grid with respect to ground ; Fig. 2B shows the " square " voltage wave at the secondary emitter SE, this voltage being suitable for feeding an inductive load such as deflecting coils ; Fig. 2C shows the voltage at the cathode C, and Fig. 2D that at the control grid. The voltage at SE is added to the exponential voltage across C1 and thus produces the more linear voltage shown in Fig. 2A. The wave form shown in Fig. 2A may be taken off at terminals X and that of Fig. 2B at terminals Y. Specification 534,576 is referred to.
GB3003639A 1939-11-14 1939-11-14 Improvements in or relating to time-base circuits Expired GB536453A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE468741D BE468741A (en) 1939-11-14
GB3003639A GB536453A (en) 1939-11-14 1939-11-14 Improvements in or relating to time-base circuits
FR933984D FR933984A (en) 1939-11-14 1946-09-27 Improvements to time base circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3003639A GB536453A (en) 1939-11-14 1939-11-14 Improvements in or relating to time-base circuits

Publications (1)

Publication Number Publication Date
GB536453A true GB536453A (en) 1941-05-15

Family

ID=10301230

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3003639A Expired GB536453A (en) 1939-11-14 1939-11-14 Improvements in or relating to time-base circuits

Country Status (3)

Country Link
BE (1) BE468741A (en)
FR (1) FR933984A (en)
GB (1) GB536453A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1039097B (en) * 1954-01-22 1958-09-18 Ebauches Sa Electronic pulse generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1039097B (en) * 1954-01-22 1958-09-18 Ebauches Sa Electronic pulse generator

Also Published As

Publication number Publication date
BE468741A (en)
FR933984A (en) 1948-05-07

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