GB540754A - Improvements in thermionic relay systems - Google Patents
Improvements in thermionic relay systemsInfo
- Publication number
- GB540754A GB540754A GB9294/40A GB929440A GB540754A GB 540754 A GB540754 A GB 540754A GB 9294/40 A GB9294/40 A GB 9294/40A GB 929440 A GB929440 A GB 929440A GB 540754 A GB540754 A GB 540754A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- screen
- resistance
- suppressor
- relay
- 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
- H04N5/04—Synchronising
- H04N5/08—Separation of synchronising signals from picture signals
- H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
540,754. Valve relay circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. May 27, 1940, No. 9294. Convention date, May 27, 1939. [Class 40 (v)] A valve relay circuit comprises a thermionic valve having a control grid, screen grid and a suppressor grid in combination with an output circuit and circuits connected to the several grids, the control grid circuit being adapted to receive impulses, there being provided means responsive to the relation between the suppressor grid voltage and the screen grid current for causing current to be passed selectively through the output circuit or the screen grid circuit. In Fig. 1 input terminals 10 are coupled by a resistance 13 and capacity 12 to the control grid of a pentode 11 the output circuit of which includes the winding of a relay 14. A power source 19 is bridged by a resistance 20 having an earthed centre tap connected to the cathode through resistance 15 and capacity 16, a positive terminal 23 which is connected to the plate through relay winding 14 and to the screen grid through resistance 17, and a negative terminal 24 which is connected through resistance 18 to the suppressor grid. A resistance 25, 26 is connected between the screen and suppressor grid leads the part 25 being bridged by a capacity 27. Due to this coupling between the screen and suppressor grids there are two stable conditions in which either the plate current or the screen grid current is large the other being small. The changeover from one to the other can be effected by successive short negative impulses applied to input terminals 10. This momentarily interrupts the plate and screen grid currents and allows condenser 27 to effect the change. The arrangement is also described for controlling the operation of an amplifier, and for operating a relay having two windings, the additional winding being connected in the screen grid circuit. A modification is described in which the value of the plate current is large or small depending on whether a long or a short negative impulse is applied to the control grid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US540754XA | 1939-05-27 | 1939-05-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB540754A true GB540754A (en) | 1941-10-28 |
Family
ID=21988609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9294/40A Expired GB540754A (en) | 1939-05-27 | 1940-05-27 | Improvements in thermionic relay systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB540754A (en) |
-
1940
- 1940-05-27 GB GB9294/40A patent/GB540754A/en not_active Expired
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