US2443864A - Voltage gain control device - Google Patents

Voltage gain control device Download PDF

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Publication number
US2443864A
US2443864A US540873A US54087344A US2443864A US 2443864 A US2443864 A US 2443864A US 540873 A US540873 A US 540873A US 54087344 A US54087344 A US 54087344A US 2443864 A US2443864 A US 2443864A
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Prior art keywords
gain control
resistor
grid
control device
cathode
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Expired - Lifetime
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US540873A
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Macauley Robert Irwin
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Allen B du Mont Laboratories Inc
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Allen B du Mont Laboratories Inc
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Priority to US540873A priority Critical patent/US2443864A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/06—Manually-operated control in untuned amplifiers having discharge tubes

Definitions

  • This invention relates to a device for controlling voltages. With this invention either alternating or direct current voltages can be varied continuously over wide ranges. Alternating current voltages of a very wide range of frequencies, in-
  • a plurality of sets of electrodes which may be in the same or separate envelopes are employed with resistors in the cathode circuits of said sets with a resistor coupling between intermediate points of said resistors. at least one of these points preferably being variable.
  • the controlled voltage is taken of! of this last named resistor.
  • Fig. 1 is a diagram of connections showing an illustrative embodiment of the invention.
  • Fig. 2 is a similar diagram showing a modification.
  • reference character 1 indicates a dual triode of which the plates 2 and 3 are connected to a source B of positive potential.
  • the input terminal 4 is connected to the grid 5 of the first triode.
  • the cathode 6 of this triode is connected to ground through resistors l and 8 which are connected in series.
  • a point ill of constant potential is connected to the grid l l of the other triode in the envelope 1, the cathode l2 of this triode being connected by series resistors l3, M and I5 to ground.
  • a point I6 is connected through resistor I! by means of a sliding contact is to the resistor ll.
  • the point [6 may be any point on resistor I.
  • a sliding contact I! on the resistor I1 is connected to the output terminal 20.
  • a resistor 22 is connected between a positive source B and the plate 2', and this plate 2' is coupled by lead 23 to one end of two resistors 24 and 25 in series, the other end of these resistors being connected to ground.
  • and 25 is connected by lead 26 to the grid ll of the second triode in the envelope l'.
  • the operation is as follows: The signal of which the amplitude is to be varied is applied to the terminal 4 which is connected to the grid 5 of the dual triode l. The plates 2 and 3 are maintained at the same potential while the potential applied at ID to the grid II is kept constant.
  • the gain control resistor I1 is connected between the point It and a point on the resistor ll that is determined by the contact I8 so that the desired voltage can be taken off of the resistor i1 by adjusting the contact 19.
  • a signal at terminal l is applied to the grid 5
  • one end of the gain resistor control I! increases or decreases in potential in accordance with the variation of the signal at this input terminal.
  • the other end of this gain control resistor II will tend to remain at a fixed potential which depends upon the position of the contactor l8 because the effective impedance of the cathode resistors l3, I4 and I5 is small.
  • a small plate load 22 in the first section of the dual triode l' provides a signal at its plate 2' that is of the correct polarity to change the potential applied by the lead 23, resistor 24 and lead 26 to the grid ll' so that the proper potential is applied to the grid II' to cancel the distorting signal that might otherwise appear at the contactor l8 of the gain control ll, l9.
  • a voltage gain control device which comprises two vacuum tubes at least one of which has its anode connected directly to a source of constant potential, each of said vacuum tubes having an anode, a control grid and a cathode, one of said tubes having its. control grid connected to a, source of constant potential and the other one having its control grid connected to a source of signal that is to be controlled, a resistance connected between each cathode and ground and a resistance off of which the output of said device is taken, said resistance being connected from a point on one of said cathode resistances between its ends and a point on the other cathode resistance between the ends thereof.
  • the device 01 claim 1 in which a slidable .v (ms contact is provided for said resistance oil. of which the output 01 said device is taken.
  • the following references are of record in the v 4.
  • the device 01' claim 1 m which a slidable file of this tent: contact is provided for said resistance of! of which UNITED the output of said device is taken and a.
  • slidable a STATES PATENTS contact is providedsbetween one end of said last Number Name Date named resistance and the resistance between the 2364-197 Hamem 1941 cathode of one of said tubes and ground. 237L875 38618? e 3, 1942 r 10 2,316,044 Blair Apr. 6, 1943 ROBERT mwm MAcAULEY. 1 Kinsbura July 1a, 1943

Description

- June R L MacAUL-EY VOLTAGE GAIN CONTROL DEVICE Filed June 17, 1944 M INVENTOR.
Patented June 22, 1948 VOLTAGE GAIN CONTROL DEVICE Robert Irwin MacAuley, Passaic, N. J., assignmto Allen B. Du Mont Laboratories, Inc., Passaio, N. 3., a corporation of Delaware Application June 17, 1944, Serial No. 540,873
4 Claims. (01. 250-27) 1 This invention relates to a device for controlling voltages. With this invention either alternating or direct current voltages can be varied continuously over wide ranges. Alternating current voltages of a very wide range of frequencies, in-
cluding very low frequencies, can be varied with-.
out the use of large coupling condensers, and no residual direct current appears across this control device.
In carrying out the invention, a plurality of sets of electrodes which may be in the same or separate envelopes are employed with resistors in the cathode circuits of said sets with a resistor coupling between intermediate points of said resistors. at least one of these points preferably being variable. The controlled voltage is taken of! of this last named resistor.
The invention may be understood -from the description in connection with the accompanying drawing, in which:
Fig. 1 is a diagram of connections showing an illustrative embodiment of the invention; and
Fig. 2 is a similar diagram showing a modification.
In the drawing, reference character 1 indicates a dual triode of which the plates 2 and 3 are connected to a source B of positive potential. The input terminal 4 is connected to the grid 5 of the first triode. The cathode 6 of this triode is connected to ground through resistors l and 8 which are connected in series.
A point ill of constant potential is connected to the grid l l of the other triode in the envelope 1, the cathode l2 of this triode being connected by series resistors l3, M and I5 to ground.
A point I6 is connected through resistor I! by means of a sliding contact is to the resistor ll. The point [6 may be any point on resistor I. A sliding contact I! on the resistor I1 is connected to the output terminal 20.
In the modification shown in Fig. 2. the parts that are common to Fig. 1 are shown by the same reference characters with primes.
In this modification a resistor 22 is connected between a positive source B and the plate 2', and this plate 2' is coupled by lead 23 to one end of two resistors 24 and 25 in series, the other end of these resistors being connected to ground. A point between the resistors 2| and 25 is connected by lead 26 to the grid ll of the second triode in the envelope l'.
The operation is as follows: The signal of which the amplitude is to be varied is applied to the terminal 4 which is connected to the grid 5 of the dual triode l. The plates 2 and 3 are maintained at the same potential while the potential applied at ID to the grid II is kept constant. The gain control resistor I1 is connected between the point It and a point on the resistor ll that is determined by the contact I8 so that the desired voltage can be taken off of the resistor i1 by adjusting the contact 19. When a signal at terminal l is applied to the grid 5, one end of the gain resistor control I! increases or decreases in potential in accordance with the variation of the signal at this input terminal. The other end of this gain control resistor II will tend to remain at a fixed potential which depends upon the position of the contactor l8 because the effective impedance of the cathode resistors l3, I4 and I5 is small.
However, asmall signal is caused to appear at the contactor l8 due to the voltage divider action of the gain control and part of the cathode load in the second section of the resistors in the circult of the cathode l2. By utilizing the circuit shown in Fig. 2, this small signal is canceled. This is done by feeding a signal of proper phase and magnitude to the grid H' of the second triode section instead of keeping this grid at a constant potential as indicated in Fig. 1.
As illustrated in Fig. 2, a small plate load 22 in the first section of the dual triode l' provides a signal at its plate 2' that is of the correct polarity to change the potential applied by the lead 23, resistor 24 and lead 26 to the grid ll' so that the proper potential is applied to the grid II' to cancel the distorting signal that might otherwise appear at the contactor l8 of the gain control ll, l9.
What is claimed is:
1. A voltage gain control device which comprises two vacuum tubes at least one of which has its anode connected directly to a source of constant potential, each of said vacuum tubes having an anode, a control grid and a cathode, one of said tubes having its. control grid connected to a, source of constant potential and the other one having its control grid connected to a source of signal that is to be controlled, a resistance connected between each cathode and ground and a resistance off of which the output of said device is taken, said resistance being connected from a point on one of said cathode resistances between its ends and a point on the other cathode resistance between the ends thereof.
2. The device of claim 1 in which the anode of one of said tubes is connected to said source of constant potential through a resistor.
4 3. The device 01 claim 1 in which a slidable .v (ms contact is provided for said resistance oil. of which the output 01 said device is taken. The following references are of record in the v 4. The device 01' claim 1 m which a slidable file of this tent: contact is provided for said resistance of! of which UNITED the output of said device is taken and a. slidable a STATES PATENTS contact is providedsbetween one end of said last Number Name Date named resistance and the resistance between the 2364-197 Hamem 1941 cathode of one of said tubes and ground. 237L875 38618? e 3, 1942 r 10 2,316,044 Blair Apr. 6, 1943 ROBERT mwm MAcAULEY. 1 Kinsbura July 1a, 1943
US540873A 1944-06-17 1944-06-17 Voltage gain control device Expired - Lifetime US2443864A (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505367A (en) * 1948-05-21 1950-04-25 Rca Corp Television receiver brightness and contrast control
US2522967A (en) * 1948-05-21 1950-09-19 Rca Corp Video amplifier feeding constant black level output to cathoderay tube
US2545244A (en) * 1949-01-15 1951-03-13 Du Mont Allen B Lab Inc Electronic circuit voltage control
US2607030A (en) * 1948-04-17 1952-08-12 Bell Telephone Labor Inc Current regulation
US2613286A (en) * 1947-06-20 1952-10-07 Deering Milliken Res Trust Cathode follower amplifier
US2658180A (en) * 1950-04-10 1953-11-03 Phillips Petroleum Co Vacuum tube voltmeter
US2676300A (en) * 1951-12-06 1954-04-20 Gen Precision Lab Inc Vacuum tube voltmeter
US2740043A (en) * 1952-03-03 1956-03-27 John E Williams Electronic linear sweep generator
US2775654A (en) * 1949-12-16 1956-12-25 Pye Ltd Circuit for adjusting amplitude distortion
US2813156A (en) * 1953-11-30 1957-11-12 Hoffman Electronics Corp Variable gain amplifier
US2846574A (en) * 1953-12-14 1958-08-05 Rca Corp Matrixing apparatus
US2864000A (en) * 1958-12-09 Apparatus for comparing the instan-
US2919393A (en) * 1953-07-17 1959-12-29 Cutler Hammer Inc Apparatus for control of electric systems
US3012666A (en) * 1961-12-12 Electrical color separation
US3015074A (en) * 1959-01-16 1961-12-26 Systron Donner Corp Stabilized d. c. amplifier

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2264197A (en) * 1939-04-17 1941-11-25 Associated Electric Lab Inc Thermionic amplifier
US2271876A (en) * 1939-06-27 1942-02-03 Rca Corp Television shading control circuit
US2316044A (en) * 1941-10-18 1943-04-06 Bell Telephone Labor Inc Electronic apparatus
US2324215A (en) * 1941-04-25 1943-07-13 Bell Telephone Labor Inc Measuring apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2264197A (en) * 1939-04-17 1941-11-25 Associated Electric Lab Inc Thermionic amplifier
US2271876A (en) * 1939-06-27 1942-02-03 Rca Corp Television shading control circuit
US2324215A (en) * 1941-04-25 1943-07-13 Bell Telephone Labor Inc Measuring apparatus
US2316044A (en) * 1941-10-18 1943-04-06 Bell Telephone Labor Inc Electronic apparatus

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2864000A (en) * 1958-12-09 Apparatus for comparing the instan-
US3012666A (en) * 1961-12-12 Electrical color separation
US2613286A (en) * 1947-06-20 1952-10-07 Deering Milliken Res Trust Cathode follower amplifier
US2607030A (en) * 1948-04-17 1952-08-12 Bell Telephone Labor Inc Current regulation
US2522967A (en) * 1948-05-21 1950-09-19 Rca Corp Video amplifier feeding constant black level output to cathoderay tube
US2505367A (en) * 1948-05-21 1950-04-25 Rca Corp Television receiver brightness and contrast control
US2545244A (en) * 1949-01-15 1951-03-13 Du Mont Allen B Lab Inc Electronic circuit voltage control
US2775654A (en) * 1949-12-16 1956-12-25 Pye Ltd Circuit for adjusting amplitude distortion
US2658180A (en) * 1950-04-10 1953-11-03 Phillips Petroleum Co Vacuum tube voltmeter
US2676300A (en) * 1951-12-06 1954-04-20 Gen Precision Lab Inc Vacuum tube voltmeter
US2740043A (en) * 1952-03-03 1956-03-27 John E Williams Electronic linear sweep generator
US2919393A (en) * 1953-07-17 1959-12-29 Cutler Hammer Inc Apparatus for control of electric systems
US2813156A (en) * 1953-11-30 1957-11-12 Hoffman Electronics Corp Variable gain amplifier
US2846574A (en) * 1953-12-14 1958-08-05 Rca Corp Matrixing apparatus
US3015074A (en) * 1959-01-16 1961-12-26 Systron Donner Corp Stabilized d. c. amplifier

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