US1931648A - Push-pull amplifier - Google Patents

Push-pull amplifier Download PDF

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Publication number
US1931648A
US1931648A US478831A US47883130A US1931648A US 1931648 A US1931648 A US 1931648A US 478831 A US478831 A US 478831A US 47883130 A US47883130 A US 47883130A US 1931648 A US1931648 A US 1931648A
Authority
US
United States
Prior art keywords
amplifier
connection
push
grid
pull
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
US478831A
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English (en)
Inventor
Dyksterhuis Popko Reinder
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.)
RCA Corp
Original Assignee
RCA Corp
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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US1931648A publication Critical patent/US1931648A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only

Definitions

  • the present invention relates to amplifiers, and more particularly to improvements in, or relating to, circuit arrangements for push-pull amplifiers.
  • This invention has reference to push-pull amplifiers, and has for its main object to provide a circuit arrangement that permits in a simple manner the controlling of the intensity, and of adjusting the balance.
  • the cathodes and the negative terminal of the source of anode current have interconnected between them a resistance consisting of-one or more parts and traversed by the anode direct current, a variable point of the said resistance being connected to the cathode, and at least one of the grids being connected to a second variable point.
  • 1 and 2 designate triodes connected in push-pull in the "usual manner.
  • the grids 15 are supplied from transformers 3 and 4, which, in reality, are'notnec essarily separated, as shown in the figure, but which may form a single push-pull transformer as Well known to those skilled in the prior art.
  • Thesecondary windings 3', 4' of transformers 3 and 4 are connected to the cathodes 14 through condensers 16 and 17.
  • the cathodes 14 are, in addition, connected through resistances 8 and 5 to the negative terminal of the source of anode current.
  • a sliding contact 9 permits the short-circuiting of part of the resistance 8. It is thus possible to give the grid bias any desired value.
  • the secondary windings of the transformers 3 and 4 are connected through resistances, or inductances,.13 and 12 respectively to the points 7 and 6 of the resistance 5.
  • the point 7 is to be considered variable, whereas the point 6 is to be assumed stationary.
  • the function of the latter arrangement is to permit compensation for any disparity in the two triodes, since if no particular means are taken it often occurs that the direct current of the two triodes of a push-pull circuit arrangeing contact 7 the direct current in one triode can be equalized in a simple manner with that in the other, an exact push-pull connection being thus ensured. It is possible to test the uniformity of the direct current inthe two triodes for example by including a milliamrneter in each of the two anode circuits.
  • the negative terminal of the anode current source and the sliding contact 'I have interconnected between them a high resistance 11. The latter ensures that if at a' given moment the sliding contact 7 does not make contact with the resistance 5, nevertheless the grid of one of the triodes is not insulated, which might give rise to wideundesired potential variations.
  • the point 6 may be variable.
  • the resistances, or inductances, 12, 13 and the condensers 16 and 17 are particularly important if the anode current is supplied from a high tension unit.
  • the said elements act as filters, and annul any alternatingvoltages that may still occur and give rise
  • the resistances 5 and 8 are not necessarily separated, but may be combined to form asingle unit.
  • the anodes of the tubes 1, 2 are connected, in any Well known manner to a utilization circuit.
  • a push-pullamplifier a connection between the positive terminal of said means and the anodes of the amplifier, a second connectionbetween the cathodes of the latter-and the negativeterminal of said means, said second connection including a bias resistor for-the grids of the amplifier, a connection between each gridoi the amplifier and the resistor, at least one of the grid connections being adjustable to secure exact push-pull operation of the amplifier, a variable resistor included in series with the bias resistor in said second connection to control the magnitude of bias applied to both grids of the amplifier, and a reactive path including a cas pacity connected between each of the said grid connections-and said cathodes to suppress hum due to pulsations-in said supply means.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US478831A 1929-09-02 1930-08-30 Push-pull amplifier Expired - Lifetime US1931648A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1931648X 1929-09-02

Publications (1)

Publication Number Publication Date
US1931648A true US1931648A (en) 1933-10-24

Family

ID=19873327

Family Applications (1)

Application Number Title Priority Date Filing Date
US478831A Expired - Lifetime US1931648A (en) 1929-09-02 1930-08-30 Push-pull amplifier

Country Status (4)

Country Link
US (1) US1931648A (nl)
DE (1) DE561912C (nl)
FR (1) FR700450A (nl)
NL (1) NL38202C (nl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533411A (en) * 1945-12-12 1950-12-12 Honeywell Regulator Co Electric proportioning control apparatus with reset
US2890329A (en) * 1952-02-01 1959-06-09 Matthew T Lebenbaum Phase detector circuit
US3106433A (en) * 1959-02-20 1963-10-08 Itt Low transient linear signal gating circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533411A (en) * 1945-12-12 1950-12-12 Honeywell Regulator Co Electric proportioning control apparatus with reset
US2890329A (en) * 1952-02-01 1959-06-09 Matthew T Lebenbaum Phase detector circuit
US3106433A (en) * 1959-02-20 1963-10-08 Itt Low transient linear signal gating circuit

Also Published As

Publication number Publication date
NL38202C (nl)
FR700450A (fr) 1931-02-28
DE561912C (de) 1932-10-20

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