GB483918A - Improvements in or relating to oscillation generators - Google Patents
Improvements in or relating to oscillation generatorsInfo
- Publication number
- GB483918A GB483918A GB2917536A GB2917536A GB483918A GB 483918 A GB483918 A GB 483918A GB 2917536 A GB2917536 A GB 2917536A GB 2917536 A GB2917536 A GB 2917536A GB 483918 A GB483918 A GB 483918A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- circuit
- resistance
- grid
- feed
- 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
- 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
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube
Landscapes
- Photoreceptors In Electrophotography (AREA)
Abstract
483,918. Valve generating circuits. STANDARD TELEPHONES & CABLES, Ltd., LAWRENCE, W., and LEVY, M. M. Oct. 27, 1936, No. 29175. [Class 40 (v)] An oscillator is provided with positive or regenerative feed-back at the oscillation frequency and with negative feed-back at all frequencies, the negative feed-back voltages being derived from a resistance in an output circuit whereby the same proportion of each component frequency in the output is fed back negatively. In the case of a dynatron oscillator having an anti-resonant circuit in the plate circuit of the valve for determining the fundamental oscillation frequency, an adjustable voltage derived from a feed-back resistance in the anode circuit of the valve is applied to the grid of the valve in such a phase as to oppose regeneration at all frequencies. The pentode valve V1 is provided with a positive feed-back coupling including a tuned antiresonant circuit C1, L1, the coil L1 being coupled to a coil L2 in the control-grid circuit. Negative feed-back is obtained from a resistance R1, so that the voltage applied to the grid consists of the sum of the voltages across the coil L2, and across the tapped part of the resistance R1, the tapping point being adjusted so that the positive feed-back is nearly neutralized by the negative feed-back. Several amplifier stages may be provided, the anodecathode circuit of the last valve being coupled to the grid-cathode circuit of the first valve as in the single-valve arrangement shown. Positive feed-back may be applied to one grid of an oscillator valve and negative feed-back to a second grid. In such an arrangement, the anode-cathode circuit includes a resistance and a coil in series, the resistance being tapped to supply the negative feed-back at all frequencies to one grid, and the coil being coupled to a tuned circuit to provide positive feedback at a particular frequency to the other grid. In a modification, the resistance R1 is connected in series with the tuned circuit and may be in series or in shunt to the output impedance, or alternatively negative feedback is obtained from a resistance in the common cathode lead providing grid bias for the valve, a byepassing condenser being connected across an adjustable portion of the resistance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2917536A GB483918A (en) | 1936-10-27 | 1936-10-27 | Improvements in or relating to oscillation generators |
| FR827954D FR827954A (en) | 1936-10-27 | 1937-10-15 | Oscillations generating devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2917536A GB483918A (en) | 1936-10-27 | 1936-10-27 | Improvements in or relating to oscillation generators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB483918A true GB483918A (en) | 1938-04-27 |
Family
ID=10287325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2917536A Expired GB483918A (en) | 1936-10-27 | 1936-10-27 | Improvements in or relating to oscillation generators |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR827954A (en) |
| GB (1) | GB483918A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2546645A (en) * | 1946-08-31 | 1951-03-27 | Conn Ltd C G | Variable frequency oscillator |
| DE878228C (en) * | 1943-12-15 | 1953-06-01 | Siemens Ag | Feedback tube generator |
-
1936
- 1936-10-27 GB GB2917536A patent/GB483918A/en not_active Expired
-
1937
- 1937-10-15 FR FR827954D patent/FR827954A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE878228C (en) * | 1943-12-15 | 1953-06-01 | Siemens Ag | Feedback tube generator |
| US2546645A (en) * | 1946-08-31 | 1951-03-27 | Conn Ltd C G | Variable frequency oscillator |
Also Published As
| Publication number | Publication date |
|---|---|
| FR827954A (en) | 1938-05-06 |
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