GB477240A - Improvements in or relating to thermionic valve circuits - Google Patents
Improvements in or relating to thermionic valve circuitsInfo
- Publication number
- GB477240A GB477240A GB5031/37A GB503137A GB477240A GB 477240 A GB477240 A GB 477240A GB 5031/37 A GB5031/37 A GB 5031/37A GB 503137 A GB503137 A GB 503137A GB 477240 A GB477240 A GB 477240A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- valve
- capacity
- anode
- grid
- 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
- 230000003071 parasitic effect Effects 0.000 abstract 3
- 230000003321 amplification Effects 0.000 abstract 1
- 239000013256 coordination polymer Substances 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
- H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Picture Signal Circuits (AREA)
Abstract
477,240. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd. Feb. 19, 1937, No. 5031. Convention date, May 16, 1936. [Class 40 (v)] To reduce parasitic noise in amplifiers for very weak currents, such as television amplifiers, the resistance in the circuit of the photoelectric cell is chosen of extremely high value, and the consequent reduction in amplification of the high-frequency signal components is compensated by the provision of a negative feed-back circuit. In the Figure, the series resistance Rg for the photo-cell CP is made large, e.g. 10 to 100 megohms, and in consequence the high-frequency signal components would be reduced by the parasitic capacity C. This is prevented by inserting a feed-back resistance Rf between the anode and grid of the valve TV1, the product of Rf and the anode-grid capacity Cag being equal to the product of Rg and C. The anode resistance Ra is also large and the frequency-discriminating effect of its parasitic shunt capacity Ca is overcome by inserting in the coupling to the next valve TV2 a resistance-capacity unit Rc, Cc of the same time constant. The valve grids are biassed to prevent grid current from flowing. When a wide band of frequencies is comprised in the signal, the lowest frequencies may be suppressed or separately handled. Specification 436,734 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR477240X | 1936-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB477240A true GB477240A (en) | 1937-12-24 |
Family
ID=8903125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5031/37A Expired GB477240A (en) | 1936-05-16 | 1937-02-19 | Improvements in or relating to thermionic valve circuits |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2202522A (en) |
| GB (1) | GB477240A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB531827A (en) * | 1939-07-10 | 1941-01-13 | Eric Lawrence Casling White | Improvements in or relating to electron discharge valve amplifiers |
| US2536617A (en) * | 1945-02-27 | 1951-01-02 | Barton L Weller | Direct current negative feedback amplifier |
| US2504829A (en) * | 1946-02-01 | 1950-04-18 | Westinghouse Electric Corp | Compensated power supply amplifier |
| US2552787A (en) * | 1946-11-23 | 1951-05-15 | Automatic Elect Lab | Channel switching in voice current repeater stations |
| US2655597A (en) * | 1947-02-24 | 1953-10-13 | Gen Electric | Limiting amplifier |
| US2598259A (en) * | 1948-09-04 | 1952-05-27 | Ephraim W Hogue | Signal amplifying system |
| US2801342A (en) * | 1951-08-04 | 1957-07-30 | Baldwin Piano Co | Preamplifier for photoelectric musical instruments |
| US2945131A (en) * | 1955-12-07 | 1960-07-12 | Barues Engineering Company | Matching circuit for radiation detectors |
| US3231659A (en) * | 1960-04-06 | 1966-01-25 | Nihon Gakki Seizo Kabushiki Ka | Volume control device for electric musical instruments |
-
1937
- 1937-02-19 GB GB5031/37A patent/GB477240A/en not_active Expired
- 1937-04-16 US US137304A patent/US2202522A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2202522A (en) | 1940-05-28 |
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