US2555872A - Multivibrator circuit - Google Patents

Multivibrator circuit Download PDF

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Publication number
US2555872A
US2555872A US667253A US66725346A US2555872A US 2555872 A US2555872 A US 2555872A US 667253 A US667253 A US 667253A US 66725346 A US66725346 A US 66725346A US 2555872 A US2555872 A US 2555872A
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US
United States
Prior art keywords
resistances
resistance
grid
anode
multivibrator circuit
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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 - Lifetime
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US667253A
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English (en)
Inventor
Carpentier Edmond Egbertus
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2555872A publication Critical patent/US2555872A/en
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    • 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

Definitions

  • This invention relates to a multivibrator circuit comprising two amplifying valves in which the circuit of an output electrode of each of the tubes is coupled via a condenser to the control grid circuit of the other tube and in which, as usual, the supply voltages of at least two similar output electrodes of the two tubes are obtained from a common source of anode voltage.
  • the steepness of the flank of the, say, pulse-shaped oscillations generated by means of the multivibrator circuit arrangement should be as large as possible.
  • the invention has for its object to provide im proved multivibrator circuit arrangements of the said type permitting of, say, pulse-shape oscillations having a particularly large flank steepness being obtained.
  • a resistance is included in a common part of the supply circuit of two similar output electrodes of the two ampliiier valves.
  • the resistance included in the common part of the supply circuit is preferably about as heavy as the resistances included in the separate parts of this supply circuit.
  • the illustrated multivibrator circuit for generating pulse-shaped oscillations or else periodical voltages varying rectangularly with time comprises two pentodes I, 2 which disrupt each other alternately and whose cathodes 3, 4 are interconnected and connected to the earthed terminal 5 of an anode voltage battery 6.
  • the screen grid 'l or 8 respectively of each of the tubes is connected on the one hand via a condenser I, 9 respectively to the control grid I2 or Il respectively and on the other hand via a resistor I3 or I4 respectively to the positive terminal 5 of the battery 6.
  • the control grids II, I2 of the tubes I, 2 are connected to the cathode by resistances I5 and I6 respectively.
  • the anode conductor of the tubes I, 2 which is connected to the terminal 5 of the battery includes anode resistances I'I, I3.
  • the generated oscillations (20) may be obtained from the output terminals I9.
  • the output terminals are connected respectively via block connection between the anode resistances I'I, I8
  • Each of the resistances 25 and 25 common respectively to the anode and the screen grid circuits respectively of the tubes l, 2 supports by itself the coupling brought about between the tubes I and 2 by the condenser-resistance combination 9, I5 and I, i6 respectively, as will be set out more fully hereinafter.
  • This inter alia renders possible a greater liberty as regards the choice of the dimensions of the other elements of the circuit, particularly of the condenser-resistance combination 9, I5 and lil, I6 respectively, with the result that the possibilities of using' circuit arrangements of the present kind are extended.
  • the potential of 'the control grid II of the tube l will be increased to such extent after a lapse of a period governed by the condenser resistance 9, I5, that the disruption of the tube I is suppressed and thus a low current again starts to flow through the tube.
  • the voltage drop consequent upon the occurrence of a screen-grid current at the screen grid resistance I3 and the resistance 2e' the potential of the screen grid I and-since the voltage at the condenser Il! cannot change immediately-also the potential of the control grid l2 of the tube 2 falls.
  • the ⁇ potential of the screen grid 8 of the tube 2 is decreased by the larger voltage drop that occurs at the resistance 25 which is common to the 3 twoscreening grid circuits.
  • the current passing through the tube '2 then decreases due on the one hand to the decrease in potential at the 4control grid l2 and due on the other hand to the decrease in potential of the screen grid.
  • the measure according to the invention also enables the condenser resistance combination 9, I5 and I0, I6 to be proportioned in such manner that these alternating voltages which by themselves bring about a coupling insufficient for generating alternating voltages which practically vary with time rectangularly, as may be desirable for example for obtaining a small RC-time for generating pulse-shaped oscillations of high frequency or in the case theoutput voltages are derived from resistances included in the respective cathode leads of the tubes bringing about negative feedback coupling; for bringing about in these cases a coupling which nevertheless is suiciently strong may be obtained by the provision of resistances common to the supply circuits of the two tubes.
  • a high-frequency multivibrator circuit comprising first and second electron discharge de- ⁇ vices each having a cathode, a control grid, a
  • rst and second resistances having the same predetermined value and serially connected between the anodes of said devices, third and fourth resistances having the same predetermined value and serially connected between the screen grids of said devices, means capacitatively coupling the screen grid of said first device to the control grid of said second device, means capacitatively coupling the screen grid of said second device to the control grid of said first device, a resistance element havingY an adjustable tap and connected between the junction of said serially connected rst and second resistance and the junction of said serially connected third and fourth resistances, and a common source of constant potential for said devices connected between the cathodes thereof and the tap in said element.
  • a high-frequency multivibrator circuit comprising rst and second electron discharge devices each having a cathode, a control grid, a
  • rst and second resistances having the same predetermined value and serially connected between the anodes cf said devices, third and fourth resistances having the same predetermined value and serially connected between the screen gridsof said devices, means capacitatively coupling the screen grid of said iirst device to the control grid of said second device, means capacitatively coupling the screen grid of said second device to the control grid of said rst device, a fth resistance having a value substantially equal to the respective values of said rst and second resistances, a sixth resistance having a value substantially equal to the value of said third and fourth resistances, and a common source of constant potential for said devices having one terminal connected to the cathodes thereof and the other terminal connected through said iifth resistance to the junction of said serially connected first and second resistances and through said sixth resistance to the junction of said serially connected third and fourth resistances.
  • a high-frequency multivibrator circuit cornprising iirst and second electron discharge devices each having a cathode, a control grid, a screen grid and an anode, first and second resistances having the same predetermined value and serially connected between the anodes of said.
  • third and fourth resistances having the same predetermined value and serially connected between the screen grids of said devices, a rst capacitor having a relatively small value connecting the screen grid of the first device to the control grid of the second device, a second capacitor having a relatively small value connecting the screen grid of the second device to the control grid of the first device, a fth resistance having a value substantially equal to the respective values of said first and second resistances, a sixth resistance having a value substantially equal to the respective values of said third and fourth resistances, a common source of constant potential'for said devices having one terminal connected to the cathodes thereof and the other terminal connected through said fifth resistance to the junction of said serially connected first and second resistances and through said sixth resistance to the junction of said serially connected third and fourth resistances, a pair of output terminals, a third capacitor connecting the anode of said rst device to one of said output terminals, and a fourth capacitor connecting the anode of said second device to the other of said Youtput terminals.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • X-Ray Techniques (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electrostatic Separation (AREA)
US667253A 1942-03-10 1946-05-04 Multivibrator circuit Expired - Lifetime US2555872A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL612539X 1942-03-10

Publications (1)

Publication Number Publication Date
US2555872A true US2555872A (en) 1951-06-05

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ID=19788148

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Application Number Title Priority Date Filing Date
US667253A Expired - Lifetime US2555872A (en) 1942-03-10 1946-05-04 Multivibrator circuit

Country Status (5)

Country Link
US (1) US2555872A (it)
DE (1) DE900704C (it)
FR (1) FR892062A (it)
GB (1) GB612539A (it)
NL (1) NL61324C (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2706751A (en) * 1948-10-05 1955-04-19 Automatic Telephone & Elect Relaxation-oscillator ringing and tone generator

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510216A (en) * 1937-05-12 1939-07-28 Wolfgang Holzer Improvements in or relating to indicating and/or recording arrangements employing cathode ray tubes
US2189317A (en) * 1938-08-31 1940-02-06 Rca Corp Diversity antenna system
US2282895A (en) * 1940-12-07 1942-05-12 Rca Corp Relaxation oscillation generator
GB555078A (en) * 1942-05-13 1943-08-03 Herbert William Pratley Improvements in multi-vibrator valve generating circuits
US2365512A (en) * 1943-03-24 1944-12-19 Gen Electric Multivibrator
US2402091A (en) * 1941-12-31 1946-06-11 Rca Corp Television system
US2403984A (en) * 1945-04-03 1946-07-16 Bell Telephone Labor Inc Representation of complex waves

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510216A (en) * 1937-05-12 1939-07-28 Wolfgang Holzer Improvements in or relating to indicating and/or recording arrangements employing cathode ray tubes
US2189317A (en) * 1938-08-31 1940-02-06 Rca Corp Diversity antenna system
US2282895A (en) * 1940-12-07 1942-05-12 Rca Corp Relaxation oscillation generator
US2402091A (en) * 1941-12-31 1946-06-11 Rca Corp Television system
GB555078A (en) * 1942-05-13 1943-08-03 Herbert William Pratley Improvements in multi-vibrator valve generating circuits
US2365512A (en) * 1943-03-24 1944-12-19 Gen Electric Multivibrator
US2403984A (en) * 1945-04-03 1946-07-16 Bell Telephone Labor Inc Representation of complex waves

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2706751A (en) * 1948-10-05 1955-04-19 Automatic Telephone & Elect Relaxation-oscillator ringing and tone generator

Also Published As

Publication number Publication date
DE900704C (de) 1954-01-04
NL61324C (it)
FR892062A (fr) 1944-03-28
GB612539A (en) 1948-11-15

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