US2144779A - Relaxation oscillator with variable frequency - Google Patents

Relaxation oscillator with variable frequency Download PDF

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Publication number
US2144779A
US2144779A US147801A US14780137A US2144779A US 2144779 A US2144779 A US 2144779A US 147801 A US147801 A US 147801A US 14780137 A US14780137 A US 14780137A US 2144779 A US2144779 A US 2144779A
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United States
Prior art keywords
resistance
charging
potential
frequency
current
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Expired - Lifetime
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US147801A
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English (en)
Inventor
Schlesinger Kurt
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.)
Loewe Opta GmbH
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Loewe Opta GmbH
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Publication date
Application filed by Loewe Opta GmbH filed Critical Loewe Opta GmbH
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Publication of US2144779A publication Critical patent/US2144779A/en
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    • 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

  • Fig. l is a connection scheme for varying uniformly the relaxation frequency within moderate limits
  • Fig. 2 is a connection scheme for varying the frequency within wide limits.
  • I is the potential source
  • 2 the charging resistance
  • 3 the relaxation condenser
  • 4 the grid-controlled gas-filled thermionic tube, which is connected with its anode and cathode to the condenser.
  • a braking resistance 6 is inserted in order to limit the discharge current.
  • oscillations of constant frequency which are independent of the potential of the mains can only be obtained if the discharge tube derives its grid bias from the charging current, so that the same is coupled with the current and accordingly with the mains potential and participates in all variations in the opposite sense.
  • the resistance 5 there is employed the resistance 5. If now the charging resistance 2 were varied, the bias 5 would also vary. As a result there would hardly occur the desired variation in frequency, but merely a variation in amplitude.
  • the charging resistance 2 Germany June 20, '1936 (01. ate-s0) is connected with a potentiometer l.
  • the charging E. M. R therefore, is varied at the wiper thereof.
  • An electric stop resistor 8 prevents the charglhgpotential to drop below the ignition po tential-of the discharge tube.
  • the potentiometer current flows also. through 5. Since the same is substantially constant it furnishes the bias at 5 with a constant basic component and already decreases the interfering dependency.
  • the oscillator is coupled with an amplifier E3 of any kind by means of a condenser I2 and a potential drivider I5, It.
  • This potential distributor is as follows: The more the same sets down the grid alternating potential, the greater are the alternating potentials which require to be generated at the anode of the discharge tube, the greater, therefore, are the charging currents which require to be passed to the condenser 3, and the smaller is the eiiect of insulation faults and leakage or initial currents at the condenser 3 or the tube 4 with respect to these charging currents to be maintained constant. It is found that the ascent of the condenser potential gains considerably in linearity if the charging currents are of the order of l m.
  • connection system according to the invention Whilst by reason of the connection system according to the invention as shown in Fig. 1 it is possible to obtain a fine adjustment of the frequency within ranges of approximately one order of magnitude, a coarse adjustment in powers of ten is obtained by switching over the condensers.
  • the connection system necessary for this purpose is shown in Fig. 2, A multiple-way double-leverswitch I I is provided for changing-over the condensers 3 together with its different braking resistances 6 and the appertaining resistances 9.
  • a relaxation oscillator comprising direct current source, a gas-filled grid-controlled thermionic tube shunted by a condenser in series with a braking resistance, a grid biassing resistance between the cathode of said tube and the negative terminal of said source and a charging resistance between the anode of said tube and the positive terminal of said source, means for varying the frequency, means to keep constant the grid bias of said tube and consequently the discharge potential of said condenser, said means consisting in a connection for keeping constant the current flowing through said biassing resistance when the current charging the condenser is varied for frequency variation.
  • the means to keep constant the current taken from said source consisting of variation means in the charging resistance.
  • a relaxation oscillator means to vary the oscillator frequency within wide limits in coarse steps, said means consisting of a set of charging condensers of difierent capacity each in series with an adapted braking resistance, a set of difierent charging resistances and a multiple-way double-lever switch inserting at once one member of either of said sets.
  • an electronic amplifier and means to couple the output of said oscillator with said amplifier said means consisting of a condenser in series to a potential divider, the intermediate terminal of said divider connected to the grid of said amplifier, said divider reducing the output potential of said oscillator for at least one order of magnitude.

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electrophonic Musical Instruments (AREA)
US147801A 1936-06-20 1937-06-11 Relaxation oscillator with variable frequency Expired - Lifetime US2144779A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE479732X 1936-06-20

Publications (1)

Publication Number Publication Date
US2144779A true US2144779A (en) 1939-01-24

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ID=6542451

Family Applications (1)

Application Number Title Priority Date Filing Date
US147801A Expired - Lifetime US2144779A (en) 1936-06-20 1937-06-11 Relaxation oscillator with variable frequency

Country Status (3)

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US (1) US2144779A (fr)
FR (1) FR823295A (fr)
GB (1) GB479732A (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425165A (en) * 1943-05-15 1947-08-05 Rca Corp Stabilized harmonic oscillator
US2519413A (en) * 1946-07-25 1950-08-22 Albert H Taylor Oscilloscope sweep circuit
US2531830A (en) * 1944-08-16 1950-11-28 Albert R Simpson Voltage pulse generator
US2533251A (en) * 1946-09-25 1950-12-12 Int Standard Electric Corp Time base circuit for cathode-ray oscillographs
US2582247A (en) * 1945-10-16 1952-01-15 Jr Hunter C Goodrich Standard impulse noise generator
US2640908A (en) * 1947-11-07 1953-06-02 United Shoe Machinery Corp Machine for progressively bonding sheet material
US2768371A (en) * 1955-06-09 1956-10-23 Westinghouse Air Brake Co Sound simulator for use in aircraft pilot trainers
US2802179A (en) * 1942-04-03 1957-08-06 Itt Indicating and calibrating means
US2947910A (en) * 1957-02-21 1960-08-02 Jr Francis H Shepard Wide range electronic sweep circuit
US3227891A (en) * 1959-09-30 1966-01-04 North America Aviat Inc Timing pulse generator
US3270323A (en) * 1962-09-04 1966-08-30 Ledex Inc Control system for separate as well as simultaneous operation of remote working elements
US3465257A (en) * 1966-05-31 1969-09-02 Honeywell Inc Function generating apparatus

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802179A (en) * 1942-04-03 1957-08-06 Itt Indicating and calibrating means
US2425165A (en) * 1943-05-15 1947-08-05 Rca Corp Stabilized harmonic oscillator
US2531830A (en) * 1944-08-16 1950-11-28 Albert R Simpson Voltage pulse generator
US2582247A (en) * 1945-10-16 1952-01-15 Jr Hunter C Goodrich Standard impulse noise generator
US2519413A (en) * 1946-07-25 1950-08-22 Albert H Taylor Oscilloscope sweep circuit
US2533251A (en) * 1946-09-25 1950-12-12 Int Standard Electric Corp Time base circuit for cathode-ray oscillographs
US2640908A (en) * 1947-11-07 1953-06-02 United Shoe Machinery Corp Machine for progressively bonding sheet material
US2768371A (en) * 1955-06-09 1956-10-23 Westinghouse Air Brake Co Sound simulator for use in aircraft pilot trainers
US2947910A (en) * 1957-02-21 1960-08-02 Jr Francis H Shepard Wide range electronic sweep circuit
US3227891A (en) * 1959-09-30 1966-01-04 North America Aviat Inc Timing pulse generator
US3270323A (en) * 1962-09-04 1966-08-30 Ledex Inc Control system for separate as well as simultaneous operation of remote working elements
US3465257A (en) * 1966-05-31 1969-09-02 Honeywell Inc Function generating apparatus

Also Published As

Publication number Publication date
GB479732A (en) 1938-02-10
FR823295A (fr) 1938-01-18

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