GB654923A - Improved multivibrators - Google Patents

Improved multivibrators

Info

Publication number
GB654923A
GB654923A GB1440946A GB1440946A GB654923A GB 654923 A GB654923 A GB 654923A GB 1440946 A GB1440946 A GB 1440946A GB 1440946 A GB1440946 A GB 1440946A GB 654923 A GB654923 A GB 654923A
Authority
GB
United Kingdom
Prior art keywords
multivibrator
valve
synchronizing pulses
dividing
frequency
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
GB1440946A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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
Priority to FR958121D priority Critical patent/FR958121A/fr
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB1440946A priority patent/GB654923A/en
Publication of GB654923A publication Critical patent/GB654923A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/00006—Changing the frequency
    • 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
    • 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
    • H03K3/08—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 astable
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Electronic Switches (AREA)

Abstract

654,923. Pulse frequency-dividing circuit. BRITISH THOMSON-HOUSTON CO., Ltd., and OWEN, C. E. May 13, 1946, No. 14409. [Class 40 (vi)] In a frequency divider comprising at least two multivibrator stages connected in series, synchronizing pulses are injected into both cathodes of each dividing circuit thus triggering both change-over points of the multivibrators and enabling them to operate in a substantially symmetrical condition with corresponding improvement in frequency stability. The double triode valves V1 and V3 are connected as normal multivibrator frequency dividers, negative synchronizing pulses at the input being differentiated and applied to the cathodes of V1a and V1b the positive excursions of the pulses being suppressed by diodes V2. When valve V1a is just cut-off the grid voltage of V1a rises, Fig. 2 (not shown), at a rate depending on C and R so that when the multivibrator is dividing by nine the fifth negative pulse occuring on the cathode causes the valve to conduct, the multivibrator changes over and a similar action occurs with valve V1b. If the second multivibrator is dividing by an odd number, synchronizing pulses are taken as shown from each anode of V1a and V1b and applied to the cathode circuits of V3a and V3b respectively, the potentials at the electrodes of valve V3 varying as in Fig. 3 (not shown). If the last multivibrator is to divide by an even number the synchronizing pulses for the two cathode circuits are derived from one of the anode circuits of valve V1.
GB1440946A 1946-05-13 1946-05-13 Improved multivibrators Expired GB654923A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR958121D FR958121A (en) 1946-05-13
GB1440946A GB654923A (en) 1946-05-13 1946-05-13 Improved multivibrators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1440946A GB654923A (en) 1946-05-13 1946-05-13 Improved multivibrators

Publications (1)

Publication Number Publication Date
GB654923A true GB654923A (en) 1951-07-04

Family

ID=10040684

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1440946A Expired GB654923A (en) 1946-05-13 1946-05-13 Improved multivibrators

Country Status (2)

Country Link
FR (1) FR958121A (en)
GB (1) GB654923A (en)

Also Published As

Publication number Publication date
FR958121A (en) 1950-03-03

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