GB542030A - Automatic volume control system - Google Patents
Automatic volume control systemInfo
- Publication number
- GB542030A GB542030A GB9077/40A GB907740A GB542030A GB 542030 A GB542030 A GB 542030A GB 9077/40 A GB9077/40 A GB 9077/40A GB 907740 A GB907740 A GB 907740A GB 542030 A GB542030 A GB 542030A
- Authority
- GB
- United Kingdom
- Prior art keywords
- anode
- negative
- resistance
- pentode
- earth
- 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
- 230000003412 degenerative effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Amplifiers (AREA)
Abstract
542,030. Automatic volume control. PHILCO RADIO & TELEVISION CORPORATION. May 22, 1940, No. 9077. Convention date, June 17, 1939. [Class 40 (v)] A degenerative plate rectifier is arranged so that negative A.V.C. potential may be taken direct from the anode. As shown in Fig. 1, the output from the signal transfer means 2, for example an intermediate frequency amplifier, is applied to a pentode 3 arranged as a degenerator plate rectifier. The detected output is taken across a cathode load resistance 4 having a byepass condenser 5, The anode is connected to earth through a resistance 7, anode circuit power being supplied by a source 6. Thus the anode is always negative with respect to earth and is increasingly negative with an increased signal. This gives a suitable negative A.V.C. voltage which is applied from the anode of pentode 3 to the grids of the valves in the earlier stages, after smoothing by resistance 8 and condenser 9. Since the total cathode current is substantially independent of the plate potential this arrangement does not affect the detection. Modifications are described in which delay is introduced by a suitably biased diode connected across impedance 7 (Figs. 2 and 3, not shown). Specification 540,454 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US542030XA | 1939-06-17 | 1939-06-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB542030A true GB542030A (en) | 1941-12-23 |
Family
ID=21989425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9077/40A Expired GB542030A (en) | 1939-06-17 | 1940-05-22 | Automatic volume control system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB542030A (en) |
-
1940
- 1940-05-22 GB GB9077/40A patent/GB542030A/en not_active Expired
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