GB818877A - Improvements in or relating to sound radio receivers - Google Patents
Improvements in or relating to sound radio receiversInfo
- Publication number
- GB818877A GB818877A GB1579557A GB1579557A GB818877A GB 818877 A GB818877 A GB 818877A GB 1579557 A GB1579557 A GB 1579557A GB 1579557 A GB1579557 A GB 1579557A GB 818877 A GB818877 A GB 818877A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detector
- resistors
- transistor
- condensers
- stages
- 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
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 239000007787 solid Substances 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
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
Landscapes
- Amplifiers (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
818,877. Transistor radio receiving circuits; detectors. GENERAL ELECTRIC CO. Ltd. May 12, 1958 [May 17, 1957], No. 15795/57. Classes 40 (5) and 40 (6). In a receiver for A.M. sound, which includes transistor I.F. amplifiers 4, 17, a solid state rectifier 27 as detector and a transistor audio amplifier (not shown), the coupling between detector and audio amplifier comprises a transformer, the primary 28 of which is in series with a direct-current load for the detector. The load is divided, comprising resistors 5, 25 in series and is by-passed for audio frequencies by condensers 7, 26, the transformer ratio being such that the A.C. and D.C. loads of the detector are equal. Resistors 24, 30 provide a standing bias across resistors 25, 5 respectively such that the detector 27 is slightly biased in the forward direction, the voltage drop across resistor 5 being used to provide both the standing bias and an A.G.C. voltage for the I.F. stages 4, 17. The I.F. stages are neutralized by condensers 34, 33 connected between the appropriate ends of the secondaries of transformers 11, 21 respectively and the bases of transistors 4, 17 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1579557A GB818877A (en) | 1957-05-17 | 1957-05-17 | Improvements in or relating to sound radio receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1579557A GB818877A (en) | 1957-05-17 | 1957-05-17 | Improvements in or relating to sound radio receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB818877A true GB818877A (en) | 1959-08-26 |
Family
ID=10065592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1579557A Expired GB818877A (en) | 1957-05-17 | 1957-05-17 | Improvements in or relating to sound radio receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB818877A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4492926A (en) * | 1980-08-14 | 1985-01-08 | Tokyo Shibaura Denki Kabushiki Kaisha | Amplitude modulation detector |
-
1957
- 1957-05-17 GB GB1579557A patent/GB818877A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4492926A (en) * | 1980-08-14 | 1985-01-08 | Tokyo Shibaura Denki Kabushiki Kaisha | Amplitude modulation detector |
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