US2456700A - Device adapted to produce sawtooth oscillations - Google Patents

Device adapted to produce sawtooth oscillations Download PDF

Info

Publication number
US2456700A
US2456700A US664499A US66449946A US2456700A US 2456700 A US2456700 A US 2456700A US 664499 A US664499 A US 664499A US 66449946 A US66449946 A US 66449946A US 2456700 A US2456700 A US 2456700A
Authority
US
United States
Prior art keywords
condenser
period
voltage
tube
discharge
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 - Lifetime
Application number
US664499A
Other languages
English (en)
Inventor
Haantjes Johan
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2456700A publication Critical patent/US2456700A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/86—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements gas-filled tubes or spark-gaps

Definitions

  • This invention relates to a device adapted to produce saw-tooth oscillations ⁇ comprising acondenser-which is charged through a resistance and which maybe discharged through a gasfilled discharge tube havinga" control" electrode; In a circuit of' thistype it i's conventional"- to include a resistance capacitance parallel network between the cathodepfthe discharge-tubeand one end of the charged condenser; the other end thereof beingconnect-e to'tlre 'anodeof 'the tube.
  • This network serves -to shorten'theextinction period" of" the time.
  • one known circuitor this type is shown*schematically in Fig: l ofth'e drawing wherein a condenser I is connected via a resistance 2'- to a source-of cha rgirrg potential 3.
  • a gaseous-discharge tube 4" whose anode is connected to the jiiiictibri of resistance 2 and condenser I, and whose'cath'od is connected in "serieswith a condenser 5 to said other end of condenser I, condenser 5 being shunted by a resistaneeti-
  • Thecontrol grid of tube 4 is connected through a resistance 1 to the end of condenser 5 which is remote from the cathode so that the voltage established across the parallel network constituted by resistance 6 and condenser 5 is impressed on the control grid.
  • condenser 5 is charged to a high voltage during the discharge of condenser I through tube 4.
  • this drawback is obviated by including two series-connected' con densers in the cathode lead of the discharge tube, each oi'which is shunted by a resistance, the period'of discharge of one condenser being smaller and that of the other condenser being: considerably greater than the period of oscillation of the oscillations to be produced.
  • the cathode lead includes. two series-connected condensers 8 and. 9 shuntedlre spectively by resistances I6 and II.-
  • Fig. 3 the variation of the negative voltage set up at the grid of tube 4 in the -circuit'ishown in Figure 1 during the period'of charge' of' condenser I is represented by curve a.
  • the voltage requiredat the grid for the ignition of tube v 4 as a function of the anode voltage appearing during the said period of charge is represented by curve I).
  • tube 4 is ignited without a syn.- chronization voltage being required for the purpose.
  • the negative grid-bias at any moment can be reduced to the ignition. voltage required at this moment by means of a positive synchronization voltage supplied to the grid.
  • the required synchronization voltage which at any moment is determined by the difference of the voltages represented by curves a and b, rapidly increases, according as the fre quency of the synchronization voltage more deviates from the natural frequency of the sawtooth generator.
  • the period of discharge of condenser 8 is smaller than the period of oscillation of the oscillations to be produced, due to which during the period of charge of condenser I condenser 8 is rapidly discharged and during the remaining part of the period of charge of the condenser the negative voltage at the grid is solely determined by the voltage set up across condenser 9.
  • the period of discharge of condenser 9 is considerably greater than the period of oscillation of the oscillations to be produced, so that the voltage set up across condenser 9 during the period of charge of condenser I decreases but slightly.
  • the circuit according to the invention thus permits of obtaining a device for producing sawtooth oscillations, which is capable of being controlled by low synchronization voltages over a wide frequency range.
  • An arrangement for generating sawtooth oscillations having a predetermined periodicity comprising a condenser, a resistor, a source of constant potential connected across said condenser through said resistor, a gaseous discharge device having a control electrode, a first resistance-capacitance parallel network, a second resistance-capacitance parallel network, said device being connected in series with said first and second networks across said condenser, the discharge period of said first network being smaller than and the discharge period of said second network being greater than the oscillation period of the sawtooth oscillations to be generated, and means to apply the voltage developed across the series-connected first and second networks to said control electrode.
  • An arrangement for generating sawtooth oscillations having a predetermined periodicity comprising a, capacitative element, a resistive element, a source of constant potential 4 for chargin said capacitative element and connected thereacross through said resistive element, a gaseous discharge device having a cathode, a control electrode'and an anode, a first resistancecapacitance parallel network, a second resistancecapacitance parallel network, said anode being connected to one end of said capacitative element 'and said cathode being connected in series with said first and second networks to the other end 'of said capacitativeelement, the discharge period of said first network being smaller than and the discharge period of said second network being greater than the oscillation period of the sawtooth oscillations to be generated, and a resistor connected between said control electrode and said other end of said capacitative element.
  • An arrangement for generating sawtooth oscillations having a predetermined periodicity comprising a capacitative element, a resistive element, a source of constant potential for charging said capacitative element and connected thereacross through said resistive element, a gaseous discharge device having a cathode, a control electrode and an anode, a first resistancecapacitance parallel network, a second resistancecapacitance parallel network, said anode being connected to one end of said capacitative element and said cathodebeing connected in series with said first and second networks to the other end of said capacitative element, the discharge period of said first network being smaller than and the discharge period of said second network being greaterthan the oscillation period of the sawtooth oscillations to be generated, a resistor connected between said control electrode and said other end of said capacitative element, and means to impress synchronizing pulses to said control electrode.

Landscapes

  • Electrically Driven Valve-Operating Means (AREA)
  • Dc-Dc Converters (AREA)
US664499A 1942-11-20 1946-04-24 Device adapted to produce sawtooth oscillations Expired - Lifetime US2456700A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL242236X 1942-11-20

Publications (1)

Publication Number Publication Date
US2456700A true US2456700A (en) 1948-12-21

Family

ID=19780627

Family Applications (1)

Application Number Title Priority Date Filing Date
US664499A Expired - Lifetime US2456700A (en) 1942-11-20 1946-04-24 Device adapted to produce sawtooth oscillations

Country Status (5)

Country Link
US (1) US2456700A (de)
BE (1) BE453230A (de)
CH (1) CH242236A (de)
FR (1) FR899876A (de)
GB (1) GB616077A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973484A (en) * 1958-09-16 1961-02-28 Roy Ross F De Frequency division system for electronic organ or the like

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973484A (en) * 1958-09-16 1961-02-28 Roy Ross F De Frequency division system for electronic organ or the like

Also Published As

Publication number Publication date
CH242236A (de) 1946-04-30
GB616077A (en) 1949-01-17
FR899876A (fr) 1945-06-13
BE453230A (de)

Similar Documents

Publication Publication Date Title
US2448070A (en) Saw-tooth generator with automatic amplitude control
US2266516A (en) Saw-tooth wave generator
US2250819A (en) Variable wave generator
US2428926A (en) Modified sweep circuit for cathoderay tubes
US2201978A (en) Frequency control circuits
US2423931A (en) Apparatus for generating sweep voltages
US2409577A (en) Synchronized blocking oscillator
US2648766A (en) Pulse width discriminator
US2375709A (en) Expansion circuit for oscilloscopes
US2492018A (en) Synchronizing system for sawtooth wave generators
US2190504A (en) Method of generating impulses and impulse generator
US2153217A (en) Oscillation generator
US2413182A (en) Radio communication system
US2165815A (en) Generator for television
US2457140A (en) Voltage control circuit
US3074027A (en) Oscillator synchronisation circuits utilising directly applied sync pulses and control voltage
US2416290A (en) Cathode-ray oscilloscope circuit
US2456700A (en) Device adapted to produce sawtooth oscillations
US2551771A (en) Electrical pulse generator
US2416292A (en) Saw-tooth wave generation
US2469227A (en) Electronic wave generating method and means
US2579525A (en) Rectangular and saw-tooth impulse generator
US2526353A (en) Stabilized low-frequency oscillator
US2582603A (en) Circuit for neutralization of frequency divider chains
US2592611A (en) Delayed pulse generator