GB375568A - Improvements in or relating to electrical oscillation generators - Google Patents
Improvements in or relating to electrical oscillation generatorsInfo
- Publication number
- GB375568A GB375568A GB20119/31A GB2011931A GB375568A GB 375568 A GB375568 A GB 375568A GB 20119/31 A GB20119/31 A GB 20119/31A GB 2011931 A GB2011931 A GB 2011931A GB 375568 A GB375568 A GB 375568A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rod
- valve
- crystal
- waves
- grid
- 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
- 230000010355 oscillation Effects 0.000 title abstract 4
- 239000013078 crystal Substances 0.000 abstract 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 230000004048 modification Effects 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000001419 dependent effect Effects 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 230000003534 oscillatory effect Effects 0.000 abstract 1
- 230000001131 transforming effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
375,568. Valve generating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London. -(Assignees of Hansell, C. W. ; Port Jefferson, Long Island, New York, U.S.A.) July 13, 1931, No. 20119. Convention date, July 18, 1930. [Classes 40 (iii) and 40 (v).] The. frequency of an oscillation generator is stabilized by producing unreflected waves in a mechanical oscillator from the output energy, transforming these waves back into electrical oscillations and feeding the latter to the input circuit of the generator. As shown a screengrid valve 2 has tuned grid and plate circuits 24, 26 and a lead 10 is taken from its plate to the electrode 14 of a piezo-crystal 12 cemented to a metal rod 8, a whole number of mechanical half-wavelengths long, and earthed at 52. A piezo-crystal 18 cemented to the other end of the rod 8 is associated with the grid of the valve the crystals and rod being clamped between the heads 46 by bolts 48 and between insulating blocks 50. The rod 8 may engage a rubber block 54 if it is desired to prevent standing waves therein. The mechanical waves produced in the rod by the crystal 12, react on the crystal 18 and produce potentials of stable frequency which are transferred in correct phase to the valve grid. Whether the bar should be an odd or even number of halfwavelengths long is determined by the orientation of the crystals 12, 18. In a modification Fig. 2 (not shown,) the rod is made of permanently magnetized iron and the crystal 18 is replaced by a pick-up coil in which currents are induced by the vibrating end of the rod and which is connected to earth and through a blocking condenser to the valve grid. In a further modification, Fig. 3 (not shown), the rod is biased and influences electrostatically a plate in proximity to its end and connected to the valve grid. The crystal 12 may also be replaced by alternative energy converters, and the rod may be replaced by a liquid or gaseous column with end diaphragms actuated in any of the ways already described. The oscillations in the tuned circuit 26, Fig. 1, may be utilized by a modulator 36, frequency multiplier 38, sideband filter 40, amplifier 42 and radiating system 44. In a further arrangement, torsional waves are produced in the rod 8, Fig. 4, (shown with its ends turned out) by vibrating the armature 68 by means of coils 82, 84 provided with magnetic cores 86, 88 and connected in series as a tuned circuit in the plate circuit of the generator 2<1>. The waves after travelling along the rod cause the vibration of armature 66 and the production of oscillatory current in the coils 72, 74 connected in series as a tuned circuit in the grid circuit of the generator 2<1>. Springs 70 provide the restoring forces for the armatures 66, 68 and with this arrangement the valve 2<1> is an ordinary triode owing to the inherent lowness of the frequencies produced. The rod is an exact number of mechanical half-wavelengths long and the phase relationships are dependent on the coil connections. A push-pull oscillator in which the restoring forces on the torsional armatures are electromagnetic is also described, Fig. 5 (not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US375568XA | 1930-07-18 | 1930-07-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB375568A true GB375568A (en) | 1932-06-30 |
Family
ID=21894979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB20119/31A Expired GB375568A (en) | 1930-07-18 | 1931-07-13 | Improvements in or relating to electrical oscillation generators |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB375568A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1205319B (en) * | 1960-12-30 | 1965-11-18 | Exxon Research Engineering Co | Oscillating circuit for a generator for ultrasound |
DE1236423B (en) * | 1962-01-05 | 1967-03-09 | Georges Ceppi | Clock oscillator |
-
1931
- 1931-07-13 GB GB20119/31A patent/GB375568A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1205319B (en) * | 1960-12-30 | 1965-11-18 | Exxon Research Engineering Co | Oscillating circuit for a generator for ultrasound |
DE1236423B (en) * | 1962-01-05 | 1967-03-09 | Georges Ceppi | Clock oscillator |
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