GB877921A - Improvements relating to transistor amplifiers - Google Patents
Improvements relating to transistor amplifiersInfo
- Publication number
- GB877921A GB877921A GB1814/58A GB181458A GB877921A GB 877921 A GB877921 A GB 877921A GB 1814/58 A GB1814/58 A GB 1814/58A GB 181458 A GB181458 A GB 181458A GB 877921 A GB877921 A GB 877921A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- stage
- resistor
- positive feedback
- jan
- 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
- 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
877,921. Transistor amplifying circuits. TELEFUNKEN G.m.b.H. Jan. 20, 1958 [Jan. 19, 1957], No. 1814/58. Class 40(6) In an amplifying stage in which the input electrode of a transistor is biased from a voltage divider R1,R2 connected across the power supply, positive feedback is used to reduce the loading thrown on the previous stage by the voltage divider. In one embodiment, transistor T1, Fig. 1, feeds a loudspeaker 3 via a tapped choke 4 and positive feedback is obtained by returning resistor R2 to one end of the choke and the collector to the other, the tap being connected to the supply. In another embodiment positive feedback is obtained by returning resistor R1, Fig. 3, to a tap on the secondary of an output transformer 5 feeding loudspeaker 3. In this embodiment negative feedback is applied across transistor T1 at high frequencies by means of condenser C2, and in addition, there is overall negative feedback including a preceding transistor stage T2, by means of resistor R4 and blocking condenser C3. The first stage may alternatively comprise a thermionic valve (Fig. 4, not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE877921X | 1957-01-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB877921A true GB877921A (en) | 1961-09-20 |
Family
ID=6818283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1814/58A Expired GB877921A (en) | 1957-01-19 | 1958-01-20 | Improvements relating to transistor amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB877921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4236118A (en) * | 1978-12-18 | 1980-11-25 | Turner Wheeler M | Stabilized remote sensing high fidelity apparatus |
-
1958
- 1958-01-20 GB GB1814/58A patent/GB877921A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4236118A (en) * | 1978-12-18 | 1980-11-25 | Turner Wheeler M | Stabilized remote sensing high fidelity apparatus |
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