GB599080A - Improvements in and relating to the frequency control of multivibrators - Google Patents

Improvements in and relating to the frequency control of multivibrators

Info

Publication number
GB599080A
GB599080A GB1021445A GB1021445A GB599080A GB 599080 A GB599080 A GB 599080A GB 1021445 A GB1021445 A GB 1021445A GB 1021445 A GB1021445 A GB 1021445A GB 599080 A GB599080 A GB 599080A
Authority
GB
United Kingdom
Prior art keywords
valves
control
valve
grids
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
GB1021445A
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.)
LAUNCELOT EDGAR CURRAH
Original Assignee
LAUNCELOT EDGAR CURRAH
Filing date
Publication date
Application filed by LAUNCELOT EDGAR CURRAH filed Critical LAUNCELOT EDGAR CURRAH
Publication of GB599080A publication Critical patent/GB599080A/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
    • H03K3/08—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Feedback Control In General (AREA)

Abstract

599,080. Frequency modulation; pulse generating circuits. CURRAH, L. E. April 23, 1945, No. 10214. [Class 40 (v)] A frequency control valve is connected across the gridcathode circuit of either or each valve of a multi-vibrator so that the control valve anode is connected to the cathode of the multivibrator valve the control valve changing from diode to triode operation or vice versa according to the value of a D.C. voltage applied to its grid thus compensating for random variations in an applied D.C. voltage or fortuitous fluctuations in the circuit frequency. The frequency of a multivibrator. Fig. 2, is varied in accordance with the magnitude of a control voltage applied to the grids of each of the control valves 1, 2, which are connected between the grids and cathodes of the oscillating valves 3, 4. The negative terminals of the separate sources of the control voltages are connected to the grids of the control valves, and are insulated from each other. The oscillating valves 3, 4 are preferably of the variable-mu type. In a modification, Fig. 3 (not shown) and Fig. 4, the control voltages are applied between the grid and anode of the valves 1, 2 so that the valves operate as diodes when the control voltages are zero, but gradually change to triode operation as the grids become increasingly negative. The grids of the oscillating valves 3, 4 are grounded through high resistances R1, R2. The output of valve 4 is fed through an integrating network to an amplifier 5 which is provided with an A.V.C. voltage derived from the output of the multivibrator through rectifier 11 and the associated circuit elements. The H.T. supply for the oscillating valves 3, 4 is stabilized by means of a valve 8, and the output of amplifier 5 is taken off through a transformer 10.
GB1021445A 1945-04-23 Improvements in and relating to the frequency control of multivibrators Expired GB599080A (en)

Publications (1)

Publication Number Publication Date
GB599080A true GB599080A (en) 1948-03-04

Family

ID=1697143

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1021445A Expired GB599080A (en) 1945-04-23 Improvements in and relating to the frequency control of multivibrators

Country Status (1)

Country Link
GB (1) GB599080A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE908628C (en) * 1950-07-20 1954-04-08 Siemens Ag Frequency modulation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE908628C (en) * 1950-07-20 1954-04-08 Siemens Ag Frequency modulation device

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