GB848669A - Improvements in or relating to transistor amplifiers - Google Patents
Improvements in or relating to transistor amplifiersInfo
- Publication number
- GB848669A GB848669A GB3598455A GB3598455A GB848669A GB 848669 A GB848669 A GB 848669A GB 3598455 A GB3598455 A GB 3598455A GB 3598455 A GB3598455 A GB 3598455A GB 848669 A GB848669 A GB 848669A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sliders
- stages
- potentiometers
- common
- dec
- 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
- 241001482320 Trachemys Species 0.000 abstract 4
- 241001482322 Trachemys scripta Species 0.000 abstract 1
- 238000010586 diagram Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
- H03G3/04—Manually-operated control in untuned amplifiers
- H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
848,669. Transistor amplifier circuits. ELECTRIC & MUSICAL INDUSTRIES Ltd. Dec. 17, 1956 [Dec. 15, 1955], No. 35984/55. Class 40(6). Gain control in a transistor amplifier is effected by connecting between two stages two potentiometers which are electrically and mechanically coupled together so that varying the position of the sliders varies the attenuation between the stages without varying substantially the impedance presented by the potentiometer network to the transistors. In Fig. 1, two potentiometers 1, 3 of the same resistance value are connected as shown between two common emitter stages, the resistance of the potentiometers being low compared with the output and input resistances of the two stages. The sliders are arranged so that, in the diagram, they are raised or lowered together. To this end, the resistances may be arranged on opposite arcs of a circle with the sliders on an angularly variable diameter or may be coaxially mounted, with a common operating spindle for the sliders or they may be in the form of a pair of parallel strips or rods with a common slider. In Fig. 4 (not shown) the gain control system is applied to a common base type amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3598455A GB848669A (en) | 1955-12-15 | 1955-12-15 | Improvements in or relating to transistor amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3598455A GB848669A (en) | 1955-12-15 | 1955-12-15 | Improvements in or relating to transistor amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB848669A true GB848669A (en) | 1960-09-21 |
Family
ID=10383692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3598455A Expired GB848669A (en) | 1955-12-15 | 1955-12-15 | Improvements in or relating to transistor amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB848669A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0318164A2 (en) * | 1987-10-29 | 1989-05-31 | Techna Vision, Inc. | Lens forming system |
-
1955
- 1955-12-15 GB GB3598455A patent/GB848669A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0318164A2 (en) * | 1987-10-29 | 1989-05-31 | Techna Vision, Inc. | Lens forming system |
| EP0318164A3 (en) * | 1987-10-29 | 1990-11-22 | Techna Vision, Inc. | Lens forming system |
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