GB776407A - Improvements in or relating to lc-oscillators - Google Patents
Improvements in or relating to lc-oscillatorsInfo
- Publication number
- GB776407A GB776407A GB15163/55A GB1516355A GB776407A GB 776407 A GB776407 A GB 776407A GB 15163/55 A GB15163/55 A GB 15163/55A GB 1516355 A GB1516355 A GB 1516355A GB 776407 A GB776407 A GB 776407A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thermistor
- circuit
- resistance
- tuned
- transformer
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- 238000010079 rubber tapping Methods 0.000 abstract 2
- 239000013078 crystal Substances 0.000 abstract 1
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L5/00—Automatic control of voltage, current, or power
-
- 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
- Oscillators With Electromechanical Resonators (AREA)
Abstract
776,407. Valve oscillator circuits. TELEFONAKTIEBOLAGET L. M. ERICSSON. May 25, 1955 [May 25, 1954], No. 15163/55. Class 40(6) An oscillator comprises an amplifier having negative and positive feedback circuits the positive feedback circuit including a transformer and thermistor combination feeding its output across part of a tuned circuit coupled to the input circuit. As shown an. auto transformer 2 providing negative feedback at the cathode feeds a regenerative voltage through a thermistor 3 to a tuned grid circuit 4, 5. The transformer may have sufficient D.C. resistance to provide the bias for the valve and D.C. may either be blocked from the thermistor by means of a capacitor or the circuit constant may be chosen such that the thermistor helps to stabilize the D.C. current. The tapping point on the tuned circuit is such that the resistance of the thermistor is much greater than the apparent resistance of the tuned circuit so that the feedback voltage is proportional to the thermistor resistance. The thermistor may alternatively be connected to a capacitive tip on the tuned circuit (Fig. 3, not shown) or a piezo electric crystal may replace the tuning capacitor 5 (Fig. 4, not .shown). With alternative amplifier arrangements it may be desirable to derive the input for the amplifier from tappings on windings 2 and 4 (Fig. 2, not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE776407X | 1954-05-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB776407A true GB776407A (en) | 1957-06-05 |
Family
ID=20333480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15163/55A Expired GB776407A (en) | 1954-05-25 | 1955-05-25 | Improvements in or relating to lc-oscillators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB776407A (en) |
-
1955
- 1955-05-25 GB GB15163/55A patent/GB776407A/en not_active Expired
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