US2325512A - Audio amplifier response control - Google Patents

Audio amplifier response control Download PDF

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Publication number
US2325512A
US2325512A US398085A US39808541A US2325512A US 2325512 A US2325512 A US 2325512A US 398085 A US398085 A US 398085A US 39808541 A US39808541 A US 39808541A US 2325512 A US2325512 A US 2325512A
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United States
Prior art keywords
tube
audio
audio amplifier
potential
circuit
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Expired - Lifetime
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US398085A
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English (en)
Inventor
Hepp Werner
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Individual
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Individual
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Publication date
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Publication of US2325512A publication Critical patent/US2325512A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/12—Electrically-operated arrangements for indicating correct tuning
    • H03J3/14—Visual indication, e.g. magic eye
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers
    • H03G5/20—Automatic control in untuned amplifiers having discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes
    • H03G9/10—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for tone control and volume expansion or compression

Definitions

  • a particularly effective regulation is secured by feeding the audio potential to the control grid of a tube serving to amplify a regulation potential, especially the amplifier system of a tuning indicator tube, and. by derivingthe said potential from the plate circuit of the regulator potential amplifier tube and using it for negative feedback.
  • the influence of the regulator potential on the band width is made more intense, while, on the other hand, there result particularly high maximum negative feedback potentials.
  • the latter is controlled by means of the regulatorpotentialobtained in the righthand diode.
  • the tuning indicator tube is V3, and the screen grid type of power tube is V4.
  • the indicator tube V3 is fed through the resistances R2,. R3 withv an AVC. potential taken off across R1, and the potential is smoothed by condenserCs so as to act as an indicator control quantity.
  • the tube V3 may be of the 6E5 typ
  • the voltage across R1 isproportional to the carrier amplitude.
  • R1 is a high-ohm resistance included in the screen gridcircuit of the power tube V4 across which an audio alternating pot'ential arises. This alternating potential is ap-.
  • the negative feedback potential is intentionally taken from the screen grid circuit of tube V4 rather than from the plate circuit.
  • the plate circuit contains v a 9 kc. trap,'or stopper circuit, Sp which, if the; negative feedback potential were derived from the plate, would have the effect that, for these. frequencies, also'the negative, feedback potentialis of a minimum value, not to'mention this further difficulty that, if the said potential were; taken from theplate circuit, undesirable phase;
  • a resistance with frequency effect more particularly a choke-coil or a resonance circuit tuned to the high frequencies.
  • this offers an advantage, first, because this restricts the negative or reverse feedback still more to the high frequencies. In other words, the slope of the band width curve is made steeper.
  • an appre ciable' frequency-dependent resistance in the screen grid lead inheres action on the amplification'factor of the tube under conditions being a, function of the frequency seeing that such screen grid alternating potentials as will arise produce a negative feedback effect.
  • aradio receiver of the type providedwith a source of audio-modulated carrier waves, a detector for producing audio voltage from the waves, an audio amplifier for the audio voltage,
  • the improvement which comprises means for impressing amplified audio voltage upon said indicator tube, means impressingthe audio Voltage output of the indicator tube upon the inputoi said amplifierin degenerative sense, and means responsive to carrier amplitude variation for varying the gain of the indicator tube.
  • an audio amplifier network having input terminals coupled to said demodulator, a tuning in-, dicator tube of, the type-having a control electrode, an output electrode and a fluorcescent target; the improvement which comprises means responsive to the amplified audio output of said audio amplifier for varying said indicator tube amplified audio output of said audio amplifier for varying said indicator tube control electrode potential, and means for feeding amplified audio potential developedat the output electrode of said indicator tube to, the input terminals of the audio amplifier.
  • an audio amplifier system comprising at least two audio amplifier tubes arranged in cascade; the last tube including a positive output, element and an auxiliary control element, a resistive element in circuit with the auxiliary element for developing amplified audio voltage thereacross, audioutilizing means in circuit with the output element or" the last tube, means including an amplifier tube to feed' the audio voltage developed across said resistive element. to the input electrode of the first audictube in degenerative phase, and automatic volume control means to vary the control electrode voltage of said amplifier tube.
  • V 6' In the receiver of the'type provided with a demodulator, of sound modulated carrier waves, an audio amplifier network having input terminals coupled to said demodulator, a tuning indicator tube of the type having a control electrode, an output electrode and a fluorescent target; the improvement which comprises means responsive to the amplified 'audiov output of said audio amplifier for controlling said indicator tube control electrod potential, means for degeneratively feeding amplified audio potential developed in the output'electrode circuit of said indicator tube to the input terminals of the audio amplifier, and carrier-responsive means for regulating the intensityof the degenerative potential.
  • an audio amplifier system comprising at least two audio amplifier tubes arranged in cascade, the last tube including a positive screen grid element, an impedance in circuit with the screen grid element, for developing. amplified audio voltage thereacross, means in circuit with the output electrode of the last tube tuned. substantially to nine kilocycles, means to feed the audio voltage developed across said impedance to the input electrode of the first audio tube in degenerative phase, and means for controlling thermagnitude of the degenerative voltage inia sense to minimize response at frequencies above said nine kilocycles.
  • an audio amplifier network having input terminals coupled to said demodulator, a second audio tube provided with a screenv circuit, a tuning indicator tube of the type having a, control electrode, an output electrode and a fluorescent target; the improvement which comprises means, responsive to the amplified audio output developed across the screen circuitor" said'second audio tube for controlling saidin'dicator tube control electrode potential, means for degeneratively feeding amplified audio potential developed in the output electrode circuit of said indicator tube to the input terminals of the audio amplifier, and means responsive to said carrier Waves for controlling themagnitudeof said degenerative potential.
  • WERNER I-IEPP The audio amplifier system as described in claim/i wherein said'audio utilizingmeans includes a nine kilocycle trap and wherein said resistive element is tuned to substantiallynine kilocycles.

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  • Amplifiers (AREA)
US398085A 1940-01-26 1941-06-14 Audio amplifier response control Expired - Lifetime US2325512A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2325512X 1940-01-26

Publications (1)

Publication Number Publication Date
US2325512A true US2325512A (en) 1943-07-27

Family

ID=7994761

Family Applications (1)

Application Number Title Priority Date Filing Date
US398085A Expired - Lifetime US2325512A (en) 1940-01-26 1941-06-14 Audio amplifier response control

Country Status (3)

Country Link
US (1) US2325512A (ja)
BE (1) BE440289A (ja)
FR (1) FR51544E (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999210A (en) * 1956-11-30 1961-09-05 Korting Radio Werke G M B H Automatic volume expander

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999210A (en) * 1956-11-30 1961-09-05 Korting Radio Werke G M B H Automatic volume expander

Also Published As

Publication number Publication date
FR51544E (fr) 1942-10-05
BE440289A (ja)

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