GB657701A - Improved methods of gain control in audio frequency amplifiers - Google Patents
Improved methods of gain control in audio frequency amplifiersInfo
- Publication number
- GB657701A GB657701A GB2271548A GB2271548A GB657701A GB 657701 A GB657701 A GB 657701A GB 2271548 A GB2271548 A GB 2271548A GB 2271548 A GB2271548 A GB 2271548A GB 657701 A GB657701 A GB 657701A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stage
- grid
- anode
- control
- screen
- 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
- 230000006835 compression Effects 0.000 abstract 2
- 238000007906 compression Methods 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 238000010079 rubber tapping Methods 0.000 abstract 2
- 206010011878 Deafness Diseases 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
-
- 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
- H03G3/06—Manually-operated control in untuned amplifiers having discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
657,701. Automatic volume control. SNEATH, O. B., and KNIGHT, E. A. Aug. 27, 1948, No. 22715. [Class 40 (iv)] [Also in Group XL (c)] In an amplifying system incorporating volume compression and also a manual gain control, a voltage derived from the rectified output of a later stage is applied to one grid of an earlier stage and a manually controlled bias is applied to another grid and/or the anode of the earlier stage. In the deaf-aid circuit, Fig. 3, for amplifying sounds picked up by the piezo-electric microphone M, the rectified output of the stage V 6 is applied to the control grid of the first stage V 4 for effecting volume compression, and the manual control is effected by the rheostat R 13 which changes the potentials of the anodes and screen grids of valves V 4 , V 5 . The circuit shown is suitable for use with low high-tension voltages, e.g. 20V. In a modification, Fig. 1 (not shown), the anode voltage of a single stage is derived from a manually controlled tapping on a resistance across the H.T. supply. In a further modification, Fig. 2 (not shown), the anode and screen potentials are obtained from a tapping on the screen grid resistor of the subsequent stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2271548A GB657701A (en) | 1948-08-27 | 1948-08-27 | Improved methods of gain control in audio frequency amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2271548A GB657701A (en) | 1948-08-27 | 1948-08-27 | Improved methods of gain control in audio frequency amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB657701A true GB657701A (en) | 1951-09-26 |
Family
ID=10183938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2271548A Expired GB657701A (en) | 1948-08-27 | 1948-08-27 | Improved methods of gain control in audio frequency amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB657701A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2221121A (en) * | 1988-07-05 | 1990-01-24 | Toshiba Kk | Speech level control circuit for telephone transmitter |
| US5229185A (en) * | 1990-10-31 | 1993-07-20 | Matsushita Electric Industrial Co., Ltd. | Speaker front sheet |
| ITBO20100163A1 (en) * | 2010-03-16 | 2011-09-17 | Parsek S R L | METHOD FOR ADJUSTING THE WORKING POINT OF A STAGE VALVE POWER AMPLIFIER FOR AN AUDIO, AND CORRESPONDING AMPLIFIER VALVE POWER AMPLIFIER |
| ITBO20100162A1 (en) * | 2010-03-16 | 2011-09-17 | Parsek S R L | METHOD FOR ADJUSTING THE MAXIMUM OUTPUT POWER OF A STAGE VALVE POWER AMPLIFIER FOR AN AUDIO AMPLIFIER, AND CORRESPONDING STAGE VALVE POWER AMPLIFIER |
-
1948
- 1948-08-27 GB GB2271548A patent/GB657701A/en not_active Expired
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2221121A (en) * | 1988-07-05 | 1990-01-24 | Toshiba Kk | Speech level control circuit for telephone transmitter |
| US5048091A (en) * | 1988-07-05 | 1991-09-10 | Kabushiki Kaisha Toshiba | Talker speech level control circuit for telephone transmitter by piezoelectric conversion |
| GB2221121B (en) * | 1988-07-05 | 1992-11-11 | Toshiba Kk | Talker speech level control circuit for telephone transmitter by piezoelectric conversion |
| US5229185A (en) * | 1990-10-31 | 1993-07-20 | Matsushita Electric Industrial Co., Ltd. | Speaker front sheet |
| GB2249454B (en) * | 1990-10-31 | 1994-08-31 | Matsushita Electric Ind Co Ltd | Speaker cover sheet |
| ITBO20100163A1 (en) * | 2010-03-16 | 2011-09-17 | Parsek S R L | METHOD FOR ADJUSTING THE WORKING POINT OF A STAGE VALVE POWER AMPLIFIER FOR AN AUDIO, AND CORRESPONDING AMPLIFIER VALVE POWER AMPLIFIER |
| ITBO20100162A1 (en) * | 2010-03-16 | 2011-09-17 | Parsek S R L | METHOD FOR ADJUSTING THE MAXIMUM OUTPUT POWER OF A STAGE VALVE POWER AMPLIFIER FOR AN AUDIO AMPLIFIER, AND CORRESPONDING STAGE VALVE POWER AMPLIFIER |
| US8705772B2 (en) | 2010-03-16 | 2014-04-22 | Parsek S.R.L. | Method for adjusting the maximum output power of a valve power amplifier stage for an audio amplifier, and corresponding valve power amplifier stage |
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