GB1236928A - Variable gain circuit - Google Patents

Variable gain circuit

Info

Publication number
GB1236928A
GB1236928A GB4649467A GB4649467A GB1236928A GB 1236928 A GB1236928 A GB 1236928A GB 4649467 A GB4649467 A GB 4649467A GB 4649467 A GB4649467 A GB 4649467A GB 1236928 A GB1236928 A GB 1236928A
Authority
GB
United Kingdom
Prior art keywords
transistor
gain control
capacitor
signal
potential
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
Application number
GB4649467A
Inventor
Griffith John Raymond Chanot
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.)
PROWEST ELECTRONICS Ltd
Original Assignee
PROWEST ELECTRONICS Ltd
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 PROWEST ELECTRONICS Ltd filed Critical PROWEST ELECTRONICS Ltd
Priority to GB4649467A priority Critical patent/GB1236928A/en
Publication of GB1236928A publication Critical patent/GB1236928A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0017—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal the device being at least one of the amplifying solid state elements of the amplifier
    • 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
    • H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

1,236,928. Gain control. PROWEST ELECTRONICS Ltd. 21 June, 1968 [11 Oct., 1967], No. 46494/67. Heading H4R. In a gain control circuit the input signal is applied to the commoned emitters of transistors T4 and T5, the current through T5 being controlled by the setting of potentiometer RV1 to vary the proportion of signal current fed through transistor T5 to the output. The base of transistor T4 is earthed while the base of transistor T5 is provided with D.C. feedback from the collector via R6 but is decoupled relative the signal current by capacitor C2, the D.C. potential across the capacitor C2 being maintained constant by connecting it via an emitter follower T3 to a circuit including transistors T1 and T2 similar to the gain control circuit and subject to the same control potential from RV1, to prevent control signal variations causing spurious signals in the output.
GB4649467A 1967-10-11 1967-10-11 Variable gain circuit Expired GB1236928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4649467A GB1236928A (en) 1967-10-11 1967-10-11 Variable gain circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4649467A GB1236928A (en) 1967-10-11 1967-10-11 Variable gain circuit

Publications (1)

Publication Number Publication Date
GB1236928A true GB1236928A (en) 1971-06-23

Family

ID=10441487

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4649467A Expired GB1236928A (en) 1967-10-11 1967-10-11 Variable gain circuit

Country Status (1)

Country Link
GB (1) GB1236928A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870964A (en) * 1973-07-16 1975-03-11 Nat Semiconductor Corp Sound volume control circuit with sound level output linearly related to volume control potentiometer setting
FR2414822A1 (en) * 1978-01-11 1979-08-10 Rubens Harvey VOLTAGE CONTROL ATTENUATOR

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870964A (en) * 1973-07-16 1975-03-11 Nat Semiconductor Corp Sound volume control circuit with sound level output linearly related to volume control potentiometer setting
FR2414822A1 (en) * 1978-01-11 1979-08-10 Rubens Harvey VOLTAGE CONTROL ATTENUATOR

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