US2100702A - Arrangement for producing relaxation oscillations - Google Patents

Arrangement for producing relaxation oscillations Download PDF

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Publication number
US2100702A
US2100702A US696065A US69606533A US2100702A US 2100702 A US2100702 A US 2100702A US 696065 A US696065 A US 696065A US 69606533 A US69606533 A US 69606533A US 2100702 A US2100702 A US 2100702A
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frequency
grid
line
resistance
mains
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Expired - Lifetime
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US696065A
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English (en)
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Schlesinger Kurt
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Individual
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Individual
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
    • H03K6/02—Amplifying pulses

Definitions

  • the subject matter of the invention is an arrangement for producing relaxation oscillations
  • all conductor portions connected with the grid are enclosed, for example by fitting the same into a completely closed screening tube.
  • the bulb itself of the glow lamp is preferably metallized, and passed to earth.
  • the filament is constructed and arranged in such fashion that the same 'is screened ofi as completely as possible by the equipotential surface against the discharge space.
  • the grid in accordance with the invention-particularly in the case of television apparatus, which operate with a constant line change frequency, which is pm high as compared with the frequency of the mains-may be earthed through the medium of a switching element, which possesses as small a resistance as possible in respect of the mains frequency and the adjacent low frequencies, whilst its (frequency-dependent) resistance is as high as possible as regards the line basic frequency and the harmonics thereof.
  • the switching element may consist of a choke, a coil connected in series with a condenser and tuned to the frequency of the mains, or the like.
  • the choke should be connected with the grid in the shortest way, and if necessary screened oil.
  • the time constant of the output lead line of the line change'oscillation generator is selected in such fashion, that this lead line does not transmit, or transmits only very poorly, a frequency lower than the basic line frequency.
  • the time constant of the output lead line of the image change oscillation generator is selected in such fashion that the latter allows quite well the passage of the image change frequency, but prevents the penetration of high frequency from the line relaxation generator.
  • the charging currents of the two relaxation generator units are each steadied per se by a separate reaction member. In this manner it is possible to overcome completely the ripples of the charging currents.
  • I and 2 are two grid-controlled gas-filled tubesofwhich l serves for producing the line change-relaxation oscillation, for exchange relaxation oscillation, for example 25 1 cycles.
  • the appertaining discharge. condensers are designated 3 and l, with the charging resistances 5 and 6 and the frequency-stabilizing resistances 1 and 8.
  • the manner of operating is such as to charge condensers 3 and l respectively at a constant rate with direct potential and to discharge them by means of the glow discharge tubes l and 2 respectively suddenly after a corresponding ignition potential has been reached.
  • the mains-connection apparatus 9 which, supplies the common anode potential, and steadies this potential (down to the extent of a remaining permissible ripple 01' up to 5%) through the medium of a mains choke III in conjunction with the two condensers H and I2.
  • the same mains apparatus generates the grid bias for the amplifiers of the two relaxation os-v cillation portions. This bias requires to be a very even one.
  • the resistance I3 at which the grid bias of the power amplifiers is tapped is disposed, between the two steadying condensers II and I2 in the manner shown, as the same is then no longer traversed only by a small part of the amplified relaxation currents, these being conducted mainly over the condenser l2.
  • the grid bias is also additionally steadied by the resistance l4 and'the condenser IS.
  • the grid bias of the power amplifiers l6 and I1 is accordingly fixed. Since, however, in the arrangement according to the invention, these amplifiers perform, in.
  • pentodes are employed as amplifiers l6 and IT.
  • the correction is adjusted at the screening grid.
  • the screening grid is connected'with the anode potential line through the medium of variable high ohmic resistances l8 and 20 adjusted once for ever to give an optimum of linearity.
  • elements may Joe dimensioned, for example, as
  • , 10 mi In place of the large and accordingly expensive condenser 2
  • the essential element is the dynamic working resistance at the Braun tube, 1. e., 22 in the case of the line portion, 23 in the image portion. This resistance should not exceed a critical maximum value of approximately 100,000 ohms and if a regulation of the size of the image is desired at all, it must be carried out as a potentiometer.
  • the output lead line of the line, relaxation oscillation generator 24-22 is provided, in accordance with the invention, with such a small timeconstant that it is not able to transmit a frequency lower than the basic line frequency.
  • the condenser 24 is accordingly made very small: for example, 24 equal to about 1,7.10 F in conjunction with 22 equal to 100,000 ohms corresponding with a time constant of 10-- seconds.
  • the corresponding system in the imageechango portion consists of the condenser 25 and the potentiometer 23 on the one hand and the resistance.
  • the por-- tion 2523 must allow the image-change frequency to pass well, for example-25 equal to 2 m1'., 23 equal to 100,000 ohms.
  • the small resistance 26 and condenser 21 have the object of preventing high frequency from penetrating from the line change portion into the television tube.
  • the grid of the tube I is connected to earth over an element, for example the choke 28, which has in respect of the mains frequency and similar low frequencies an exceedingly small impedance, whilst its impedance in respect of the basic line frequency and harmonics thereof is as great as possible.
  • an element for example the choke 28, which has in respect of the mains frequency and similar low frequencies an exceedingly small impedance, whilst its impedance in respect of the basic line frequency and harmonics thereof is as great as possible.
  • the choke 28 requires to be connected with the cathode of I, or the resistance 1, in the shortest fashion, and it must be avoided that the connecting wire is also traversed at the same time by powerful unsteady currents from other parts of the apparatus.
  • the feed of the synchronizing potential takes place through the medium of the condenser 29, which is intended to form in conjunction with the grid choke a filter chain against frequencies lower than the line harmonics.
  • the grid choke 28 is also not affected by the least magnetic alternating fields.
  • the same ifmecessary should be screened on and armoured. It may also be constructed in the form of a toroid or the like.
  • the charging currents of the two units are each steadied per se by a separate reaction member.
  • the line change osci llation generator there are employed for this Purpose the resistance 30 of 100,000 ohms and the condenser 3
  • these members serve for overcoming the smallest rip-
  • the frequency-stabilizing resistance 1, or 8 (in 1 the order of a few thousand ohms) is constructed in the form of an externally operable potentiometer preferably having a limited angle of rotation. If the resistance is decreased, the relaxation amplitude also decreases, whilst the frequency increases, and vice versa.
  • the resistance 34 and the condenser 35 serve for filtering the long impulses ingly of the production of television images free of curvature.
  • a relaxation oscillation generator for producing the line deflecting voltage
  • a mains supply apparatus for supplying said relaxation oscillation generator from the commercial mains, said generator including a gas-filled discharge tube. having hot cathode, grid and anode, an impedance being connected between said'grid and said cathode, said impedance having a low apparent resistance with respect to the frequency of said commercial mains and a great apparent resistance with respect to the frequency of said line deflecting voltage.
  • paratus for supplying said relaxation oscillation generator from the commercial mains, said generator including a gas-filled discharge tube having hot cathode, grid and anode, a choke being connected between said grid and said cathode, said choke having a low apparent resistance with respect to the frequency of said commercial mains and a great apparent resistance with respect to the frequency of said line deflecting voltage.
  • a television arrangement comprising a relaxation oscillation generator for producing the line deflecting voltage, a mains supply apparatus for supplying said relaxation oscillation generator from the commercial mains, said generator including a gas-filled discharge tube having hot cathode, grid and anode, an impedance being connected between said grid and said cathode, said impedance having a low apparent resistance with respect to the frequency of said commercial mains and-a great apparent resistance with respect to the frequency of said line deflecting voltage, and screening means, said impedance being encased by said screening means.

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  • Elimination Of Static Electricity (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US696065A 1932-11-04 1933-10-31 Arrangement for producing relaxation oscillations Expired - Lifetime US2100702A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE429427X 1932-11-04

Publications (1)

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US2100702A true US2100702A (en) 1937-11-30

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US696065A Expired - Lifetime US2100702A (en) 1932-11-04 1933-10-31 Arrangement for producing relaxation oscillations

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US (1) US2100702A (fr)
FR (1) FR763300A (fr)
GB (1) GB429427A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450164A (en) * 1943-02-12 1948-09-28 Napier & Son Ltd Means for testing electrical ignition systems of internal-combustion engines
US2457663A (en) * 1946-03-16 1948-12-28 Rca Corp Protective system
US2487071A (en) * 1946-10-15 1949-11-08 Napier & Son Ltd Apparatus for testing ignition systems for internal-combustion engines
US2487070A (en) * 1946-01-17 1949-11-08 Napier & Son Ltd Apparatus for testing the electrical ignition systems of internal-combustion engines
US2582014A (en) * 1948-05-08 1952-01-08 Radio Ind S A Soc Scanning device for television transmitters
US2740892A (en) * 1952-02-14 1956-04-03 Sala Oskar Synchronizing system for electrical musical instruments
US3156846A (en) * 1960-06-30 1964-11-10 Jr Hugo J Wilms High power thyratron inverter with a low value resistor by-pass

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2450164A (en) * 1943-02-12 1948-09-28 Napier & Son Ltd Means for testing electrical ignition systems of internal-combustion engines
US2487070A (en) * 1946-01-17 1949-11-08 Napier & Son Ltd Apparatus for testing the electrical ignition systems of internal-combustion engines
US2457663A (en) * 1946-03-16 1948-12-28 Rca Corp Protective system
US2487071A (en) * 1946-10-15 1949-11-08 Napier & Son Ltd Apparatus for testing ignition systems for internal-combustion engines
US2582014A (en) * 1948-05-08 1952-01-08 Radio Ind S A Soc Scanning device for television transmitters
US2740892A (en) * 1952-02-14 1956-04-03 Sala Oskar Synchronizing system for electrical musical instruments
US3156846A (en) * 1960-06-30 1964-11-10 Jr Hugo J Wilms High power thyratron inverter with a low value resistor by-pass

Also Published As

Publication number Publication date
GB429427A (en) 1935-05-30
FR763300A (fr) 1934-04-26

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