GB647598A - Improvements in or relating to thermionic valve circuits - Google Patents

Improvements in or relating to thermionic valve circuits

Info

Publication number
GB647598A
GB647598A GB956448A GB956448A GB647598A GB 647598 A GB647598 A GB 647598A GB 956448 A GB956448 A GB 956448A GB 956448 A GB956448 A GB 956448A GB 647598 A GB647598 A GB 647598A
Authority
GB
United Kingdom
Prior art keywords
valve
circuit
grid
pulse
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
GB956448A
Inventor
Edmund Harry Cooke-Yarborough
Charles David Florida
Cyril Norman Davey
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.)
Minister of Supply In Her Majesty S Government
Original Assignee
Minister of Supply In Her Majesty S Government
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 Minister of Supply In Her Majesty S Government filed Critical Minister of Supply In Her Majesty S Government
Priority to GB956448A priority Critical patent/GB647598A/en
Publication of GB647598A publication Critical patent/GB647598A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
    • H03K3/05—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using means other than a transformer for feedback
    • H03K3/06—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using means other than a transformer for feedback using at least two tubes so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/10—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using means other than a transformer for feedback using at least two tubes so coupled that the input of one is derived from the output of another, e.g. multivibrator monostable

Abstract

647,598. Pulse lengthening circuits. MINISTER OF SUPPLY. April 6, 1948, No. 9564. [Class 40 (vi)] The Figure shows a flip-flop circuit in which valve 1 is normally cut-off and valve 2 conducting the cathode follower valve 8 acting as a buffer stage. When a negative triggering pulse is applied at the input 18 the current flow in valve 2 is reduced and the rise in its anode potential is applied via valve 8 to the screengrid of valve 1. The screen-grid and control grid of valve 1 in the cut-off condition have a potential close to that of their cathode so that when the screen-grid potential is increased the current through the valve rapidly increases and the circuit is tripped to the unstable condition with valve 2 cut-off and valve 1 conducting. After a period determined by the time constant of network 3, 15 the charge on capacitor 3 leaks away until valve 2 is rendered conducting, the screen-grid voltage of valve 1 decreases and the circuit reverts to its initial stable condition. The restoration to the stable state is made more rapid by the low resistance leakage path for capacitor 3 which is provided by diode 16. The circuit is stabilized and rendered less affected by change in valve characteristics &c. by the application of negative feed-back over valve 1 via resistor 6 and over valve 2 via resistor 11, the cathode follower stage 8 and resistor 14. The sensitivity of the circuit may be adjusted by the setting of potentiometer 9. The circuit may be used to produce an output pulse at terminal 20 of large amplitude and long duration from an input pulse of small amplitude and short duration.
GB956448A 1948-04-06 1948-04-06 Improvements in or relating to thermionic valve circuits Expired GB647598A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB956448A GB647598A (en) 1948-04-06 1948-04-06 Improvements in or relating to thermionic valve circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB956448A GB647598A (en) 1948-04-06 1948-04-06 Improvements in or relating to thermionic valve circuits

Publications (1)

Publication Number Publication Date
GB647598A true GB647598A (en) 1950-12-20

Family

ID=9874421

Family Applications (1)

Application Number Title Priority Date Filing Date
GB956448A Expired GB647598A (en) 1948-04-06 1948-04-06 Improvements in or relating to thermionic valve circuits

Country Status (1)

Country Link
GB (1) GB647598A (en)

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