US1744935A - Multivibrator - Google Patents

Multivibrator Download PDF

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Publication number
US1744935A
US1744935A US160507A US16050727A US1744935A US 1744935 A US1744935 A US 1744935A US 160507 A US160507 A US 160507A US 16050727 A US16050727 A US 16050727A US 1744935 A US1744935 A US 1744935A
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Prior art keywords
grids
cathode
multivibrator
grid
plate
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Expired - Lifetime
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US160507A
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Pol Balthasar Van Der
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RCA Corp
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RCA Corp
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Publication of US1744935A publication Critical patent/US1744935A/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

Definitions

  • the present invention has referenceto a so-called multi-vibrator circuit-arrangement.
  • such arrangement consists essentially of an even number of triodes mutually coupled in resistance amplifying circuits, the anode of the last triode being coupled retroactively to the grid of the first one.
  • Such system in its simplest arrangement (comprising but two triodes) is diagrammatically shown in Figure 1 of the accompanying drawing. Intense current impulses periodically occur in these systems, the frequency of said impulses being determined by the values of C and R.
  • triodes are replaced by tetrodes (doublegrid valves), between the two grids of which the periodically discharged condenser is interposed, one of said two grids being connected to the cathode across the leak resistance.
  • a multivibrator comprising a multi electrode space discharge device including two grids, a cathode, and a plate electrode. a condenser coupling the grids, a leak resist ance connecting one of said grids to the oathode, and the other grid being connected to the cathode through a source of high potential, and a connectionbetween the plate and said source of high potential.
  • a multivibrator comprising a tetrode having two grids, a cathode, and a plate electrode, a condenser coupling the grids, a leak resistance connecting one of said grids to the cathode, a source of high potential connected to the plate, and a resistance connect- .ing the other of said grids to the source of high potential.
  • a multivibrator comprising a tetrode having two grids, a cathode, and a plate electrode, a condenser coupling the grids, a leak resistance connecting the grid located adjacent to the plate, to the cathode, and a source of high otential connected to the other of, said gri s and the plate.
  • a multivibrator comprising a multielectrode space discharge device including two grids, a cathode, and a plate electrode, a condenser coupling the grids, a leak resistance connecting one of said grids to the cathode, and the other grid having a potential approaching that of the plate, and a source of potential connected to the plate.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Description

Jan. 28, 1930. 1 B. VAN DER POL 1,744,935
MULT I VI BRAT 0R Filed Jan. 11. 1927' INVENTOR THASAR VAN an 9:
BY A TORNEY Patented Jan. 28, 1930 UNITED STATES PATENT? OFFICE BALTEASAR VAN DER POL, OF EINDHOVEN, NETHERLANDS, ASSIGNOR TO THE RADIO CORIPORATION OF AMERICA, A CORPORATION OF NEW YORK MULTIVIBRATOR Application filed January 11, 1927, Serial No. 160,507, and in the Netherlands January 12, 1928.
The present invention has referenceto a so-called multi-vibrator circuit-arrangement. In its original form such arrangement consists essentially of an even number of triodes mutually coupled in resistance amplifying circuits, the anode of the last triode being coupled retroactively to the grid of the first one. Such system in its simplest arrangement (comprising but two triodes) is diagrammatically shown in Figure 1 of the accompanying drawing. Intense current impulses periodically occur in these systems, the frequency of said impulses being determined by the values of C and R.
According to the invention the same results are reached with half the number of thermionic apparatus, provided the triodes are replaced by tetrodes (doublegrid valves), between the two grids of which the periodically discharged condenser is interposed, one of said two grids being connected to the cathode across the leak resistance.
An electrical-scheme of an embodiment of the invention is shown in Figure 2.
In a discharge tube are sealed an anode A, a filament F and between them two grids G and G The filament F is supplied from a battery B and the current in the anode circuit is supplied by a battery B and if desired, by a battery B connected in series therewith. The point P of the anode circuit is connected directly to the grid G and with the interposition of a condenser C (which may be adjustable or not) to the other grid G The latter grid is finally connected through a leak resistance R to the filament. The value of the condenser C should be, for example, between 2000 centimeters and 1 microfarad, the resistance 7* being at this point some thousands of ohms and the resistance R being about 1 megohm.
In such a system periodic current impulses are maintained, which are audible, for example, in a telephone or other receiving apparatus T in the anode circuit. This phenomenon may briefly be explained somewhat as follows: During each impulse the condenser C is discharged and in the reverse sense recharged at a very high starting speed which, however, gradually decreases until again a discharge occurs but by this time in the reverse sense. The low selfinduction present in the connecting wires maintains the phenomenon in somewhat the same manner as that in which too small a flywheel maintains the operation of a piston-machine having two dead points. The smaller the said selfinduction, the more different from the sine-shape will be the current curve of the discharges and the more easily it will be possible, if so desired, to sift out very high harmonics. Thus, it is, for example, possible to generate radiofrequencies in a high frequency circuit coupled across a high frequency transformer to the anode circuit, the oscillations generated in the anode circuit being comprised within the audible region.
What I claim is:
1. A multivibrator comprising a multi electrode space discharge device including two grids, a cathode, and a plate electrode. a condenser coupling the grids, a leak resist ance connecting one of said grids to the oathode, and the other grid being connected to the cathode through a source of high potential, and a connectionbetween the plate and said source of high potential.
2. A multivibrator comprising a tetrode having two grids, a cathode, and a plate electrode, a condenser coupling the grids, a leak resistance connecting one of said grids to the cathode, a source of high potential connected to the plate, and a resistance connect- .ing the other of said grids to the source of high potential.
3. A multivibrator comprising a tetrode having two grids, a cathode, and a plate electrode, a condenser coupling the grids, a leak resistance connecting the grid located adjacent to the plate, to the cathode, and a source of high otential connected to the other of, said gri s and the plate.
4. A multivibrator comprising a multielectrode space discharge device including two grids, a cathode, and a plate electrode, a condenser coupling the grids, a leak resistance connecting one of said grids to the cathode, and the other grid having a potential approaching that of the plate, and a source of potential connected to the plate.
In testimon whereof I aflix my signature, at the city 0 Eindhoven, this 13th day of December, 1926.
BALTHASAR VAN DER POL.
US160507A 1926-01-12 1927-01-11 Multivibrator Expired - Lifetime US1744935A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1744935X 1926-01-12

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US1744935A true US1744935A (en) 1930-01-28

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US160507A Expired - Lifetime US1744935A (en) 1926-01-12 1927-01-11 Multivibrator

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US (1) US1744935A (en)
FR (1) FR627347A (en)
NL (1) NL21416C (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546401A (en) * 1947-04-24 1951-03-27 Sylvania Electric Prod Muting system for radio receivers
US2600891A (en) * 1946-09-20 1952-06-17 Stephen M Macneille Vacuum system leak detector
US2610298A (en) * 1947-12-26 1952-09-09 Gen Electric Stabilized saw tooth oscillator
DE889309C (en) * 1935-02-06 1953-09-10 Telefunken Gmbh Circuit arrangement for generating a sawtooth-shaped current curve for the magnetic deflection of cathode rays, in particular for television purposes
US3066633A (en) * 1945-12-27 1962-12-04 Bell Telephone Labor Inc Signal translating systems

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE889309C (en) * 1935-02-06 1953-09-10 Telefunken Gmbh Circuit arrangement for generating a sawtooth-shaped current curve for the magnetic deflection of cathode rays, in particular for television purposes
US3066633A (en) * 1945-12-27 1962-12-04 Bell Telephone Labor Inc Signal translating systems
US2600891A (en) * 1946-09-20 1952-06-17 Stephen M Macneille Vacuum system leak detector
US2546401A (en) * 1947-04-24 1951-03-27 Sylvania Electric Prod Muting system for radio receivers
US2610298A (en) * 1947-12-26 1952-09-09 Gen Electric Stabilized saw tooth oscillator

Also Published As

Publication number Publication date
NL21416C (en)
FR627347A (en) 1927-10-01

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