US1906441A - Amplifying electrical impulses - Google Patents

Amplifying electrical impulses Download PDF

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Publication number
US1906441A
US1906441A US313144A US31314428A US1906441A US 1906441 A US1906441 A US 1906441A US 313144 A US313144 A US 313144A US 31314428 A US31314428 A US 31314428A US 1906441 A US1906441 A US 1906441A
Authority
US
United States
Prior art keywords
light
input
amplifying
amplifier
electrical impulses
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
US313144A
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English (en)
Inventor
Ernst F W Alexanderson
Ray D Kell
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.)
General Electric Co
Original Assignee
General Electric 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 General Electric Co filed Critical General Electric Co
Priority to US313144A priority Critical patent/US1906441A/en
Priority to GB29339/29A priority patent/GB335068A/en
Priority to DEI39504D priority patent/DE545200C/de
Priority to FR683433D priority patent/FR683433A/fr
Application granted granted Critical
Publication of US1906441A publication Critical patent/US1906441A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
    • H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only

Definitions

  • Our invention relates to means for amplifying electrical impulses and has for its principal object the provision of an improved amplifying apparatus and method of operation whereby instability of the amplified impulses due to temperature variations and other causes is avoided.
  • Fig. 1 is a wiring diagram of an amplif ying apparatus wherein our invention had been embodied; and Fig. 2 illustrates an apparatus including a light sensitive cell suitable for controlling the input circuit voltage of the amplifier and a device which may be utilized for regulating the illumination of this light sensitive cell in accordance with an electrical condition in the output circuit of the amplifier.
  • the amplifying apparatus illustrated by Fig. 1 includes an antenna 1 and an input circuit 2 between which a plurality of space discharge amplifiers 3, 4 and 5 and a pushpull oscillation generator 6 are connected in cascade with one another. Electrical imulses modulated in with vammm amaum a g indicated are a lied to t e mpu C11- c1pt 2 through means siown as a 1g sensitive cell i8, part of a battery 9 and a resistor 10 which is connected between the cathode and grid of the device 3.
  • the battery 9 is also connected to the input circuits of the devices 4 and 5 through adjustable taps and the resistors 11 and 12 respectively; that current is supplied from a source 13 directly to the output circuit of the oscillation generator 6 and through resistors 14, 15 and 16 to output circuits of the devices 3, 4 and 5; and that the devices 3, 4 and 5 are coupled together through coupling resistors 17 and 18.
  • the oscillation generator 6 may be of any suitable type. It is illustrated as provided with an input circuit which is coupled to a high frequency source 19 through a transformer 20 and is connected to the output circuit of the device 5, through both a source 21 for producing a negative bias potentialand the input terminals of a pair of space discharge devices 22 and 23. The generator 6 is also provided with an output circuit which is coupled to the antenna 1 through a transformer 24.
  • the output circuit of the device 5 includes a current responsive device 25, the source 13 and the resistor 16. As indicated more clearly by Fig. 2, the light sensitive cell 8 is provided with terminals 26 and 27 and with a window 28.
  • the device 25 may be similar in construction to any type of meter or galvanometer which produces a deflection dependent on an electrical condition, such as current. It is preferably so arranged that it does not obstruct the light beam 7 and projects into the window 28 another light beam of an intensity dependent on the output current of the device 5.
  • this result has been satisfactorily produced by means of a moving coil type of galvanometer provided with a lamp 29, with a screen 30 having an opening adjacent the lamp and with a small piece of white paper 31 mounted on the indicator 32 of the galvanometer and arranged to move more or less into alinement with the opening of the screen, thus diffusing the light of the lamp 29 so that more or less of it is projected into the window 28.
  • the device 25 be so mounted and arranged that the paper 31 moves across the opening of the screen 30 only far enough to project through the window 28 the amount of light required to neutralize the effect of changes in the temperatures of the resistors of the amplifier and shifting bias potential. Under these conditions, the tendency of the last stages of the amplifier to drift out of their working range due to temperature or other changes is avoided and the operation of the amplifier is rendered independent of the temperature or other conditions under which it is operated.
  • the operation of the amplifying apparatus as a whole is well understood by those skilled in the art and need not be described in details. It should be noted, however, that capacity effects between the various parts of the apparatus are minimized due to the fact that the grid bias potentials of the devices 4 and 5 are derived from the battery 9 which, together with battery 13, is preferably grounded and enclosed by a separate shielded casing.
  • the proper grid potential in each case is of course established by adjusting the tap through which the grid is connected to the battery. It has been found that this method of adjusting grid potential not only minimizes undesirable oscillations but also produces a high degree of amplification.
  • the amplifying apparatus differs from that of the aforesaid patent in that it responds to either alternating or direct current whereas the capacity coupled amplifier disclosed by the patent responds only to alternating current and does not require a critical balance because any slight change in the resistance of the resistors or in the value of the grid bias potential is not transmitted through the coupling condensers of the system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
US313144A 1928-10-17 1928-10-17 Amplifying electrical impulses Expired - Lifetime US1906441A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US313144A US1906441A (en) 1928-10-17 1928-10-17 Amplifying electrical impulses
GB29339/29A GB335068A (en) 1928-10-17 1929-09-27 Improvements relating to means for amplifying electrical impulses
DEI39504D DE545200C (de) 1928-10-17 1929-10-08 Verfahren zur Konstanthaltung des Verstaerkungsgrades bei rein widerstandsgekoppelten Verstaerkern
FR683433D FR683433A (fr) 1928-10-17 1929-10-17 Perfectionnements aux systèmes amplificateurs électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US313144A US1906441A (en) 1928-10-17 1928-10-17 Amplifying electrical impulses

Publications (1)

Publication Number Publication Date
US1906441A true US1906441A (en) 1933-05-02

Family

ID=23214558

Family Applications (1)

Application Number Title Priority Date Filing Date
US313144A Expired - Lifetime US1906441A (en) 1928-10-17 1928-10-17 Amplifying electrical impulses

Country Status (4)

Country Link
US (1) US1906441A (fr)
DE (1) DE545200C (fr)
FR (1) FR683433A (fr)
GB (1) GB335068A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2833935A (en) * 1955-02-01 1958-05-06 Rca Corp Motor control circuit
US2878395A (en) * 1956-07-16 1959-03-17 Lindly & Company Inc Photoelectric system
US2897373A (en) * 1954-06-18 1959-07-28 Acf Ind Inc Servo projector

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1058559B (de) * 1957-11-26 1959-06-04 Philips Nv Regelschaltung fuer elektrische Verstaerker
DE1257208B (de) * 1962-04-30 1967-12-28 Fujio Suganuma Selbsttaetiger Lautstaerkeregler fuer eine elektroakustische Lautsprecheranlage

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897373A (en) * 1954-06-18 1959-07-28 Acf Ind Inc Servo projector
US2833935A (en) * 1955-02-01 1958-05-06 Rca Corp Motor control circuit
US2878395A (en) * 1956-07-16 1959-03-17 Lindly & Company Inc Photoelectric system

Also Published As

Publication number Publication date
GB335068A (en) 1930-09-18
FR683433A (fr) 1930-06-12
DE545200C (de) 1932-02-26

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