GB624022A - Improvements in or relating to time bases - Google Patents
Improvements in or relating to time basesInfo
- Publication number
- GB624022A GB624022A GB3702246A GB3702246A GB624022A GB 624022 A GB624022 A GB 624022A GB 3702246 A GB3702246 A GB 3702246A GB 3702246 A GB3702246 A GB 3702246A GB 624022 A GB624022 A GB 624022A
- Authority
- GB
- United Kingdom
- Prior art keywords
- potential
- valve
- hand side
- waveform
- saw
- 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
- H03K4/12—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 voltage is produced across a capacitor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Details Of Television Scanning (AREA)
Abstract
624,022. Saw-tooth generating circuits. CINEMA-TELEVISION, Ltd., and SOWERBY, J. M. Dec. 16, 1946, No. 37022. [Class 40 (vi)] In a voltage waveform generating circuit of the type which alternates between two distinct states, such as those giving rise to the scan and flyback in the case of a saw-tooth generator, the amplitude of the waveform is stabilized by preventing the instantaneous value of the waveform from exceeding that of a reference voltage. The Figure shows a Puckle type hard valve saw-tooth generator comprising valves 4 and 5 and a main capacitor 1, the positive and negative excursions of the lower plate of which are respectively limited by circuits comprising valves 17 and 6. In the latter circuit current through the right-hand side of cathode-coupled double triode 6 falls with the potential of point P. When it falls below a value determined by the bias EA on the right-hand side, the left-hand side conducts, applying a negative pulse to the suppressor grid of the phasereversing pentode 5 of the time-base, thus starting the flyback and causing the potential of point P to rise until the time base reverts to the scan condition or until rise in potential has been sufficient to cause the left-hand side of double triode 17 to conduct as well as the right, which is normally conducting, so that the potential across the common cathode resistor rises causing valve 16 to conduct and lower the grid potential of the discharging valve 4 of the time base, blocking it and thus initiating the scan. The value of potential at P when this occurs is determined by the voltage across resistor 12 and hence by the bias EB on the right-hand side of valve 17. Synchronization is effected by injecting a suitable waveform into the circuits of valves 6 and 17, or on to the guide valve 4 or valve 5.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3702246A GB624022A (en) | 1946-12-16 | 1946-12-16 | Improvements in or relating to time bases |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3702246A GB624022A (en) | 1946-12-16 | 1946-12-16 | Improvements in or relating to time bases |
Publications (1)
Publication Number | Publication Date |
---|---|
GB624022A true GB624022A (en) | 1949-05-26 |
Family
ID=10393091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3702246A Expired GB624022A (en) | 1946-12-16 | 1946-12-16 | Improvements in or relating to time bases |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB624022A (en) |
-
1946
- 1946-12-16 GB GB3702246A patent/GB624022A/en not_active Expired
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