GB499538A - Amplifier arrangement for television purposes - Google Patents
Amplifier arrangement for television purposesInfo
- Publication number
- GB499538A GB499538A GB34741/37A GB3474137A GB499538A GB 499538 A GB499538 A GB 499538A GB 34741/37 A GB34741/37 A GB 34741/37A GB 3474137 A GB3474137 A GB 3474137A GB 499538 A GB499538 A GB 499538A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier
- valve
- supplied
- grid
- potentiometer
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
Abstract
499,538. Valve amplifying circuits. RADIOAKT.-GES. D. S. LOEWE. Dec. 15, 1937, No. 34741. Convention date, Dec. 16, 1936. [Class 40 (v)] Rectified reaction is used to bias the grid of a valve used in a television amplifier to prevent the grid swinging positive on peak loads. As shown in Fig. 2, the additional bias is supplied through rectifier 6 from a tapping on potentiometer 7, the tapping being normally arranged so that the voltage tapped off is 1/V of the output, where V is the amplification factor of the valve. The invention can be applied to a receiver circuit as shown in Fig. 3. With such an arrangement, the normal D.C. coupling between detector 11 and output stage 10 is replaced by condenser 2 and leak resistance 3, the high plate current required by valve 11 being fed through resistance 13. The rectifier 6, potentiometer 7 and condenser 9 are supplied as in Fig. 2. Synchronizing pulses are supplied either to the grid circuit over transformers 16a, 17a or to the plate circuit over transformers 16 and 17 and rectifier 14, the rectifier 14 being suitably biassed by potentiometers 15. Rectifiers 6, 14 may be housed in a single bulb to form a double diode.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE499538X | 1936-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB499538A true GB499538A (en) | 1939-01-25 |
Family
ID=6545477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34741/37A Expired GB499538A (en) | 1936-12-16 | 1937-12-15 | Amplifier arrangement for television purposes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2227026A (en) |
| FR (1) | FR832177A (en) |
| GB (1) | GB499538A (en) |
| NL (1) | NL54199C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2548436A (en) * | 1946-01-25 | 1951-04-10 | Hazeltine Corp | Television receiver background control circuit |
| US2515763A (en) * | 1948-10-22 | 1950-07-18 | Gen Electric | Direct current restoration circuit for television |
| US2708687A (en) * | 1949-05-10 | 1955-05-17 | Motorola Inc | Combined direct current reinserter and synchronizing pulse separator |
| US2572179A (en) * | 1949-05-24 | 1951-10-23 | Philco Corp | Peak leveling circuit |
| US2800528A (en) * | 1949-06-23 | 1957-07-23 | Du Mont Allen B Lab Inc | Video amplifier bridge circuit for minimizing supply voltage variations |
| US2598929A (en) * | 1949-12-15 | 1952-06-03 | Philco Corp | Direct current reinsertion circuit |
| US2672505A (en) * | 1950-06-13 | 1954-03-16 | Avco Mfg Corp | Black level shift compensating amplifier |
-
0
- NL NL54199D patent/NL54199C/xx active
-
1937
- 1937-12-13 US US179566A patent/US2227026A/en not_active Expired - Lifetime
- 1937-12-15 FR FR832177D patent/FR832177A/en not_active Expired
- 1937-12-15 GB GB34741/37A patent/GB499538A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR832177A (en) | 1938-09-22 |
| NL54199C (en) | |
| US2227026A (en) | 1940-12-31 |
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