GB529383A - Improvements in or relating to thermionic valve circuits for the generation of saw tooth currents - Google Patents
Improvements in or relating to thermionic valve circuits for the generation of saw tooth currentsInfo
- Publication number
- GB529383A GB529383A GB14467/39A GB1446739A GB529383A GB 529383 A GB529383 A GB 529383A GB 14467/39 A GB14467/39 A GB 14467/39A GB 1446739 A GB1446739 A GB 1446739A GB 529383 A GB529383 A GB 529383A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- potential
- anode
- load
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/10—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only
- H03K4/26—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor
- H03K4/28—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device
- H03K4/32—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements vacuum tubes only in which a sawtooth current is produced through an inductor using a tube operating as a switching device combined with means for generating the driving pulses
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
529,383. Valve generating circuits; television. WHITE, E. L. C. May 15, 1939, No. 14467. [Classes 40 (iii) and 40 (v)'] A circuit for generating a desired wave-form, particularly a circuit of the "resonant return" type for generating linear sawtooth currents for inductive loads, comprises a valve 6, the output circuit of which includes the inductive load 8, 9 and a second valve 13 effectively in shunt with the load, a control potential being applied to the grid of valve 13 to control the potential difference developed across the load to maintain the desired linearity of the current in the load. The valve 6 is of high impedance and is in the cathode and grid circuits of the valve 13, which thus acts as a cathode follower and causes the potential of the anode of valve 6 to follow the control potential applied to the grid of valve 13. This control potential may be substantially constant as in Fig. 1, or may be dependent on the anode current in the valve 6 as in Figs. 4, 5, or may be derived from the load as in Fig. 6. The wave form may be further improved by a negative feed-back from the anode of valve 13 to the grid of valve 6, e.g. by a condenser 17, Fig. 1, or 24, Fig. 5, or by a transformer 23, Fig. 4. A diode 28, Figs. 4, 6 may be inserted between the valves 6, 13 to protect the cathode heater insulation against the high positive potentials developed on the anode of valve 6 during the generation of the short-flank of the saw-tooth wave. In Fig. 1, when the valve 6 is rendered non-conducting by a negative synchronizing impulse 5, the current through the valve is suddenly decreased and the oscillatory circuit, formed by the coils 8 and their distributed capacity and other stray capacities, performs a half cycle of oscillation, generating the short flank of the wave. When the valve 6 is rendered non-conducting, its anode potential rises, causing valve 13 to become non- conductive. As soon as one half cycle of oscillation is complete, the potential of the anode of valve 6, and thus on the cathode of valve 13, is decreased to such a value that valve 13 again conducts, causing the oscillation to cease, and permitting valve 6 to commence generating a further flank of the saw-tooth wave. The duration of the synchronizing pulses should be equal to the duration of the short flank of the saw-tooth wave. In Fig. 4, a control potential of saw-tooth form applied to the grid of valve 13 is derived from the screen grid of valve 6 and is proportional to the anode current of valve 6. The potential thus developed across valve 13 is applied to the load 8, 9 to compensate for the effect ot the resistance of the load. In Fig. 5, the control potential applied to valve 13 is derived from the screen of valve 6, and in order to effect "keystone" modulation a frame-frequency saw-tooth component indicated at F is fed to the grid of valve 30, the anode of which is connected' via condenser 33 to the grid of valve 13. In order to correct slight " skewness " of the resulting scanned patch, a frame frequency component in opposite phase is supplied by valve 30 via resistance 37 to the grid of a valve 35, in parallel with valve 6. The synchronizing pulses are applied to the grid of a valve 38, the anode of which is connected to the grid of valve 6. In Fig. 6, the control potential applied to valve 13 is derived from the load circuit 8, 12, being applied to the grid of a valve 51. A constant potential is applied to the grid of a valve 50. associated with 51, the anode circuits of these valves being connected to the grid of valve 13. The grid of valve 50 may also have applied to it a frame frequency saw-tooth potential for " Keystone " modulation as in Fig. 5. Instead of utilizing synchronizing pulses as in Figs. 1, 4, 5, the valve 6 is controlled by a saw-tooth potential 55 derived from a blocking oscillator. Specifications 400,976 and 482,740 are referred to.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL74558D NL74558C (en) | 1939-05-15 | ||
GB14467/39A GB529383A (en) | 1939-05-15 | 1939-05-15 | Improvements in or relating to thermionic valve circuits for the generation of saw tooth currents |
US335381A US2280990A (en) | 1939-05-15 | 1940-05-15 | Thermionic valve circuits for the generation of saw tooth currents |
FR879640D FR879640A (en) | 1939-05-15 | 1940-05-15 | Improvements to circuits comprising thermionic lamps intended for the production of sawtooth currents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB14467/39A GB529383A (en) | 1939-05-15 | 1939-05-15 | Improvements in or relating to thermionic valve circuits for the generation of saw tooth currents |
Publications (1)
Publication Number | Publication Date |
---|---|
GB529383A true GB529383A (en) | 1940-11-20 |
Family
ID=10041718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB14467/39A Expired GB529383A (en) | 1939-05-15 | 1939-05-15 | Improvements in or relating to thermionic valve circuits for the generation of saw tooth currents |
Country Status (4)
Country | Link |
---|---|
US (1) | US2280990A (en) |
FR (1) | FR879640A (en) |
GB (1) | GB529383A (en) |
NL (1) | NL74558C (en) |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB581324A (en) * | 1942-06-26 | 1946-10-09 | John Mathieson Dodds | Improvements in relaxation circuits for producing electrical impulses at regular recurrence frequencies |
US2516135A (en) * | 1943-07-22 | 1950-07-25 | James R Moore | Modulator circuit |
US2449998A (en) * | 1943-07-22 | 1948-09-28 | John C Hansen | Modulator circuit |
BE482008A (en) * | 1944-10-09 | |||
US2489155A (en) * | 1944-12-30 | 1949-11-22 | Allis Chalmcrs Mfg Company | Electric control circuit |
BE465641A (en) * | 1945-06-01 | |||
US2512305A (en) * | 1945-12-15 | 1950-06-20 | Philco Corp | Electrical system |
US2571131A (en) * | 1946-01-21 | 1951-10-16 | Farnsworth Res Corp | Sweep circuit |
US2579633A (en) * | 1946-03-01 | 1951-12-25 | Le Roy J Wadzinski | Variload and varibias circuits |
US2470197A (en) * | 1946-09-25 | 1949-05-17 | Rca Corp | Electron beam deflection control system |
US2466537A (en) * | 1947-02-28 | 1949-04-05 | Remington Rand Inc | Cathode-ray tube sweep circuit |
BE487602A (en) * | 1948-02-28 | |||
BE488391A (en) * | 1948-04-09 | |||
BE490931A (en) * | 1948-09-02 | |||
US2574732A (en) * | 1949-04-01 | 1951-11-13 | Rca Corp | Automatic control for wave forms |
US2642532A (en) * | 1949-09-30 | 1953-06-16 | Raytheon Mfg Co | Electron discharge circuits |
BE500219A (en) * | 1949-12-30 | |||
US2599798A (en) * | 1950-01-13 | 1952-06-10 | Avco Mfg Corp | Linearity control circuit for television receivers |
US2761092A (en) * | 1950-02-27 | 1956-08-28 | Electronique & Automatisme Sa | Inductive charges feeding circuit |
BE507000A (en) * | 1950-06-25 | |||
NL80427C (en) * | 1950-09-20 | |||
DE1001431B (en) * | 1952-12-18 | 1957-01-24 | Fernseh Gmbh | Arrangement for linearizing the deflection current of vertical frequency for cathode ray tubes |
ES2594452B1 (en) * | 2015-06-17 | 2017-09-28 | Gamesa Innovation & Technology, S.L. | Lightning rod system for wind turbine blades with an effective injection area in carbon fiber laminates and a balanced distribution of the intensity and voltage of lightning currents between different conductive paths |
-
0
- NL NL74558D patent/NL74558C/xx active
-
1939
- 1939-05-15 GB GB14467/39A patent/GB529383A/en not_active Expired
-
1940
- 1940-05-15 US US335381A patent/US2280990A/en not_active Expired - Lifetime
- 1940-05-15 FR FR879640D patent/FR879640A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2280990A (en) | 1942-04-28 |
FR879640A (en) | 1943-03-01 |
NL74558C (en) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB529383A (en) | Improvements in or relating to thermionic valve circuits for the generation of saw tooth currents | |
US2185363A (en) | Thermionic valve circuits | |
GB471737A (en) | Improvements in and relating to electric oscillation generators | |
GB563569A (en) | Improvements in saw-tooth wave form electric oscillation generators | |
US2479081A (en) | Deflection circuits | |
US2832003A (en) | Compensated sweep circuit | |
US2179607A (en) | Cathode ray deflecting circuits | |
US2137262A (en) | Television system | |
GB455497A (en) | Improvements in and relating to generators of electrical oscillations | |
US2364756A (en) | Harmonic generator | |
GB616261A (en) | Improvements in and relating to pulse generating circuits | |
GB622002A (en) | Improvements in or relating to thermionic valve circuit arrangements | |
US2254087A (en) | Electrical oscillation generator | |
US2300996A (en) | Electric oscillation generating circuits | |
GB478511A (en) | Improvements in or relating to thermionic valve oscillatory circuits | |
US2146769A (en) | Separately controlled relaxation oscillator | |
US2570875A (en) | Sweep wave generating circuits | |
US3358183A (en) | Auto-oscillating horizontal deflection circuitry particularly for television sets | |
US2665379A (en) | Frequency divider | |
US2250686A (en) | Saw-tooth wave oscillator | |
US2296727A (en) | Deflecting output circuits for cathode ray tubes | |
US2427491A (en) | Thermionic valve oscillator with positive and negative feedback | |
US2258962A (en) | Regenerative oscillator | |
GB553851A (en) | Television scanning system | |
US2607897A (en) | Oscillator |