GB855342A - Improvements in transistor amplifiers - Google Patents
Improvements in transistor amplifiersInfo
- Publication number
- GB855342A GB855342A GB2837755A GB2837755A GB855342A GB 855342 A GB855342 A GB 855342A GB 2837755 A GB2837755 A GB 2837755A GB 2837755 A GB2837755 A GB 2837755A GB 855342 A GB855342 A GB 855342A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier
- transistor
- circuit
- bias
- resistor
- 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 2
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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0261—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the polarisation voltage or current, e.g. gliding Class A
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Multimedia (AREA)
- Amplifiers (AREA)
Abstract
855,342. Transistor amplifier circuits. MULTITONE ELECTRIC CO. Ltd. Jan. 4, 1957 [Oct. 5, 1955], No. 28377/55. Class 40(6). A junction transistor amplifier has a load in the emitter circuit and comprises a bias circuit consisting of a rectifier having one side connected through a capacitor to the emitter and the other side connected to the supply so that an increase mean current flows through the transistor as the signal amplitude increases. In Fig. 1 bias is applied to the base of the transistor from a capacitor and rectifier circuit C, M connected across the load terminals L1, L2, a small standing bias being obtained from a potentiometer R1, R2 to prevent distortion at low signal levels. One of the resistors may be temperature sensitive so as to stabilize the transistor operation. In an alternative circuit (Fig. 2 not shown) the resistor R2 is connected in series with the rectifier, while in Fig. 3 (not shown) a resistor is connected in parallel with the rectifier so that the zero signal current is still small even at high temperatures. The invention may also be applied to push pull amplifiers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2837755A GB855342A (en) | 1955-10-05 | 1955-10-05 | Improvements in transistor amplifiers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2837755A GB855342A (en) | 1955-10-05 | 1955-10-05 | Improvements in transistor amplifiers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB855342A true GB855342A (en) | 1960-11-30 |
Family
ID=10274690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2837755A Expired GB855342A (en) | 1955-10-05 | 1955-10-05 | Improvements in transistor amplifiers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB855342A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2128431A (en) * | 1982-09-24 | 1984-04-26 | Ates Componenti Elettron | Improvements in or relating to audio power amplifiers with automatic adjustment of output stage bias current |
-
1955
- 1955-10-05 GB GB2837755A patent/GB855342A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2128431A (en) * | 1982-09-24 | 1984-04-26 | Ates Componenti Elettron | Improvements in or relating to audio power amplifiers with automatic adjustment of output stage bias current |
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