GB1144186A - Improvements in scanning circuits for cathode-ray tubes - Google Patents
Improvements in scanning circuits for cathode-ray tubesInfo
- Publication number
- GB1144186A GB1144186A GB5507766A GB5507766A GB1144186A GB 1144186 A GB1144186 A GB 1144186A GB 5507766 A GB5507766 A GB 5507766A GB 5507766 A GB5507766 A GB 5507766A GB 1144186 A GB1144186 A GB 1144186A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- capacitors
- circuit
- dec
- via resistor
- 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
- H03K4/83—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices with more than two PN junctions or with more than three electrodes or more than one electrode connected to the same conductivity region
- H03K4/84—Generators in which the semiconductor device is conducting during the fly-back part of the cycle
-
- 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
- H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
- H03K4/60—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor
- H03K4/69—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as an amplifier
- H03K4/72—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth current is produced through an inductor using a semiconductor device operating as an amplifier combined with means for generating the driving pulses
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K6/00—Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass
- H03K6/04—Modifying slopes of pulses, e.g. S-correction
Landscapes
- Details Of Television Scanning (AREA)
Abstract
1,144,186. Transistor sawtooth circuits. COMPAGNIE FRANCAISE THOMSON HOUSTON-HOTCHKISS BRANDT. 8 Dec., 1966 [8 Dec., 1965], No. 55077/66. Heading H3T. A field deflection circuit for a television receiver comprises a unijunction transistor oscillator coupled via a capacitive divider to an output transistor. As shown, the series capacitors C2 ... C4 charge via resistor R2 during each scan until unijunction transistor T1 breaks down, discharging the capacitors. The capacitors form a lower impedance drive to the output transistor T2. Feed back via resistor R3 to the junction of capacitors C3, C4, together with the effect of the finite time constant of the inductor L provides an S-shaped deflection current in the coils L2 as required for flat screen correction. Resistors R3, R5 respectively control linearity and amplitude. The circuit may be synchronized at A. Fig. 1 (not shown) relates to a known circuit in which capacitor C2 is omitted and an emitter follower interposed between point D and the base of transistor T2.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR41359A FR1467113A (en) | 1965-12-08 | 1965-12-08 | Improvements to cathode ray tube scanning circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1144186A true GB1144186A (en) | 1969-03-05 |
Family
ID=8594754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5507766A Expired GB1144186A (en) | 1965-12-08 | 1966-12-08 | Improvements in scanning circuits for cathode-ray tubes |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE690674A (en) |
ES (1) | ES334061A1 (en) |
FR (1) | FR1467113A (en) |
GB (1) | GB1144186A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4241265A (en) * | 1977-08-31 | 1980-12-23 | Rca Corporation | Television vertical ramp generator |
EP0241284B1 (en) * | 1986-04-11 | 1992-12-30 | RCA Thomson Licensing Corporation | Television display system |
GB8630921D0 (en) * | 1986-12-24 | 1987-02-04 | Rca Corp | Vertical sawtooth generator |
-
1965
- 1965-12-08 FR FR41359A patent/FR1467113A/en not_active Expired
-
1966
- 1966-12-02 ES ES0334061A patent/ES334061A1/en not_active Expired
- 1966-12-05 BE BE690674D patent/BE690674A/xx unknown
- 1966-12-08 GB GB5507766A patent/GB1144186A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1467113A (en) | 1967-01-27 |
BE690674A (en) | 1967-06-05 |
ES334061A1 (en) | 1967-11-01 |
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