GB1178277A - Improvements in or relating to Electric Amplifier Circuits. - Google Patents

Improvements in or relating to Electric Amplifier Circuits.

Info

Publication number
GB1178277A
GB1178277A GB2925867A GB2925867A GB1178277A GB 1178277 A GB1178277 A GB 1178277A GB 2925867 A GB2925867 A GB 2925867A GB 2925867 A GB2925867 A GB 2925867A GB 1178277 A GB1178277 A GB 1178277A
Authority
GB
United Kingdom
Prior art keywords
transistor
june
photo
amplifier stage
relating
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
GB2925867A
Inventor
Leslie Henry Guildford
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Publication of GB1178277A publication Critical patent/GB1178277A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
    • H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
    • H03F3/087—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light with IC amplifier blocks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)

Abstract

1,178,277. Transistor amplifying circuits. MULLARD Ltd. 11 June, 1968 [27 June, 1967], No. 29528/67. Heading H3T. A transistor having a photo-resistive cell in its emitter circuit and a constant base voltage has its collector load capacitively connected to an amplifier stage, which input being a virtual earth. In Fig. 4, the photo-cell RC is in the emitter circuit of transistor TR1 which has a constant base voltage applied by means of UDR1 which can either be an asymmetrically voltage-dependent resistor or several diodes biased in the forward direction. A collector load is capacitively coupled to the amplifier stage DA, which has a parallel path of R5, C2, such that its input terminal A becomes a virtual earth. By means of this circuit a low frequency response is possible without a prohibitive size of capacitor.
GB2925867A 1967-06-27 1967-06-27 Improvements in or relating to Electric Amplifier Circuits. Expired GB1178277A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2952867 1967-06-27

Publications (1)

Publication Number Publication Date
GB1178277A true GB1178277A (en) 1970-01-21

Family

ID=10292962

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2925867A Expired GB1178277A (en) 1967-06-27 1967-06-27 Improvements in or relating to Electric Amplifier Circuits.

Country Status (1)

Country Link
GB (1) GB1178277A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113588A2 (en) * 1983-01-03 1984-07-18 Jerome Y. Lettvin Method of and apparatus for low noise current amplification

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113588A2 (en) * 1983-01-03 1984-07-18 Jerome Y. Lettvin Method of and apparatus for low noise current amplification
EP0113588A3 (en) * 1983-01-03 1985-12-18 Jerome Y. Lettvin Method of and apparatus for low noise current amplification

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