GB906512A - Improvements in balanced input amplifiers - Google Patents
Improvements in balanced input amplifiersInfo
- Publication number
- GB906512A GB906512A GB2869759A GB2869759A GB906512A GB 906512 A GB906512 A GB 906512A GB 2869759 A GB2869759 A GB 2869759A GB 2869759 A GB2869759 A GB 2869759A GB 906512 A GB906512 A GB 906512A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillator
- rectifier
- oscillation
- transistor
- circuit
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/38—Dc amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
- H03F3/387—Dc amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Ceramics (AREA)
Abstract
906,512. Automatic voltage control systems; inductors. MULTITONE ELECTRIC CO. Ltd. Nov. 16, 1960 [Aug. 21, 1959], No. 28697/59. Classes 38 (2) and 38 (4). [Also in Group XL (c)] In a transistor amplifier (see Group XL (c)), the first stage draws its power from and so modulates the amplitude of oscillation of, the second stage which comprises an oscillator. In one modification the transistor oscillator T10, Fig. 4, draws its supply from the collector circuit of a transistor rectifier T11, via resistor R18, rectifier X2 and smoothing condenser C10, providing a D.C. negative feedback circuit which maintains the mean amplitude of oscillation constant. In a modification (Fig. 5, not shown) in which the oscillator is followed by a high-frequency amplifier, the mean amplitude of oscillation is maintained constant by feeding the oscillator from the negative supply via a resistor and from the collector circuit of the high frequency amplifier via a rectifier. A mechanical negative feedback arrangement may also be used; in this the rectified output current of the system is passed through a moving coil C working in the gap of a magnet A and operating a recording stylus G. The moving coil C is also coupled to a nickel silver disc H which provides variable damping on the oscillatory circuit which is wound on a ferrite core K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2869759A GB906512A (en) | 1959-08-21 | 1959-08-21 | Improvements in balanced input amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2869759A GB906512A (en) | 1959-08-21 | 1959-08-21 | Improvements in balanced input amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB906512A true GB906512A (en) | 1962-09-19 |
Family
ID=10279659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2869759A Expired GB906512A (en) | 1959-08-21 | 1959-08-21 | Improvements in balanced input amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB906512A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4015472A (en) * | 1976-03-09 | 1977-04-05 | Fischer & Porter Co. | Two-wire transmission system for vortex flowmeter |
-
1959
- 1959-08-21 GB GB2869759A patent/GB906512A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4015472A (en) * | 1976-03-09 | 1977-04-05 | Fischer & Porter Co. | Two-wire transmission system for vortex flowmeter |
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