GB915290A - Improvements in circuits incorporating transistors - Google Patents
Improvements in circuits incorporating transistorsInfo
- Publication number
- GB915290A GB915290A GB529559A GB529559A GB915290A GB 915290 A GB915290 A GB 915290A GB 529559 A GB529559 A GB 529559A GB 529559 A GB529559 A GB 529559A GB 915290 A GB915290 A GB 915290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- bias
- thermistor
- current
- feb
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
-
- 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
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/302—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in bipolar transistor amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
915,290. Transistor amplifying circuits. PYE Ltd. Feb. 3, 1960 [Feb. 16, 1959], No. 5295/59. Class 40 (6). [Also in Group XXXVI] The current through a transistor V 1 is stabilized against temperature variations by means of a thermistor R 2 having a negative temperature coefficient connected to control the bias of transistor V 1 and in thermal contact with it, so that a rise in temperature alters the value of the resistor R 2 and thus adjusts the bias. By directly connecting the base of transistor V 2 to the emitter of V 1 the current through the power transistor V 2 is also stabilized. A potentiometer comprising resistor R 1 and thermistor R 2 is connected across the supply and provides the bias to transistor V 1 , so that on an increase of ambient or junction temperatures the resistance of R 2 decreases, the alteration of the bias due to the change in R 2 reducing the increase in emitter current. The thermistor may be mounted in direct contact with a metal clamp, Fig. 2 (not shown), holding the transistor in position on a heat-insulating base in order to provide good thermal contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB529559A GB915290A (en) | 1959-02-16 | 1959-02-16 | Improvements in circuits incorporating transistors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB529559A GB915290A (en) | 1959-02-16 | 1959-02-16 | Improvements in circuits incorporating transistors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB915290A true GB915290A (en) | 1963-01-09 |
Family
ID=9793430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB529559A Expired GB915290A (en) | 1959-02-16 | 1959-02-16 | Improvements in circuits incorporating transistors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB915290A (en) |
-
1959
- 1959-02-16 GB GB529559A patent/GB915290A/en not_active Expired
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