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
Links
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 230000000135 prohibitive effect Effects 0.000 abstract 1
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.
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)
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 |
-
1967
- 1967-06-27 GB GB2925867A patent/GB1178277A/en not_active Expired
Cited By (2)
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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