GB575395A - Improvements in or relating to electric oscillation generators - Google Patents

Improvements in or relating to electric oscillation generators

Info

Publication number
GB575395A
GB575395A GB480044A GB480044A GB575395A GB 575395 A GB575395 A GB 575395A GB 480044 A GB480044 A GB 480044A GB 480044 A GB480044 A GB 480044A GB 575395 A GB575395 A GB 575395A
Authority
GB
United Kingdom
Prior art keywords
valve
positive
feed
negative
thermistor
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
Application number
GB480044A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB480044A priority Critical patent/GB575395A/en
Publication of GB575395A publication Critical patent/GB575395A/en
Priority to FR970485D priority patent/FR970485A/en
Expired legal-status Critical Current

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
    • H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
    • H03B5/26—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator frequency-determining element being part of bridge circuit in closed ring around which signal is transmitted; frequency-determining element being connected via a bridge circuit to such a closed ring, e.g. Wien-Bridge oscillator, parallel-T oscillator
    • H03B5/28—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator frequency-determining element being part of bridge circuit in closed ring around which signal is transmitted; frequency-determining element being connected via a bridge circuit to such a closed ring, e.g. Wien-Bridge oscillator, parallel-T oscillator active element in amplifier being vacuum tube

Abstract

575,395. Valve generating circuits. STANDARD TELEPHONES & CABLES, Ltd., HARTLEY, G. C., and KING, J; A. B. March 15, 1944, No. 4800. [Class 40 (v)] An oscillation generator comprises a thermionic valve amplifier having separate positive and negative feed-back paths with resistancecapacity means for frequency determination in the positive feed-back path and a directly heated thermistor in the negative feed-back path for stabilizing the output. The Figure shows a two-valve amplifier with positive feedback from the anode of valve V2 via blocking condenser K2 and the frequency controlling network having resistances R1 and R2 and capacities C1 and C2 to the grid of valve VI, and a negative feed-back path via K2 and the highly sensitive element or " thermistor " T, which has a negative temperature coefficient, to the cathode of the valve V1. Increase in anode voltage of the valve V2 decreases the resistance T, thereby increasing the negative feed-back so reducing the output. T and the cathode resistor R3 can be interchanged provided a thermistor with a positive temperature coefficient is now used. Frequency control can be effected by varying any of R1, R2, C1 and C2, the preferred method being to vary either, R1 and R2 together keeping the ratio R1/R2 constant, or C1 and C2 together keeping the ratio C1/C2 constant, thus ensuring a constant value of the positive feed-back.
GB480044A 1944-03-15 1944-03-15 Improvements in or relating to electric oscillation generators Expired GB575395A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB480044A GB575395A (en) 1944-03-15 1944-03-15 Improvements in or relating to electric oscillation generators
FR970485D FR970485A (en) 1944-03-15 1946-03-21 Improvements to electric oscillation generators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB480044A GB575395A (en) 1944-03-15 1944-03-15 Improvements in or relating to electric oscillation generators

Publications (1)

Publication Number Publication Date
GB575395A true GB575395A (en) 1946-02-15

Family

ID=9784033

Family Applications (1)

Application Number Title Priority Date Filing Date
GB480044A Expired GB575395A (en) 1944-03-15 1944-03-15 Improvements in or relating to electric oscillation generators

Country Status (2)

Country Link
FR (1) FR970485A (en)
GB (1) GB575395A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001341B (en) * 1954-12-08 1957-01-24 Ericsson Telefon Ab L M Negative feedback bridge oscillator
US2911595A (en) * 1955-06-14 1959-11-03 Gen Electric Relaxation oscillators and control method therefor
DE1122997B (en) * 1960-04-06 1962-02-01 Hartmann & Braun Ag Circuit arrangement for stabilizing the amplitude of self-excited vibration generators
DE1235382B (en) * 1959-09-07 1967-03-02 Richard Guenther Dipl Ing Circuit arrangement for amplitude control for oscillators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001341B (en) * 1954-12-08 1957-01-24 Ericsson Telefon Ab L M Negative feedback bridge oscillator
US2911595A (en) * 1955-06-14 1959-11-03 Gen Electric Relaxation oscillators and control method therefor
DE1235382B (en) * 1959-09-07 1967-03-02 Richard Guenther Dipl Ing Circuit arrangement for amplitude control for oscillators
DE1122997B (en) * 1960-04-06 1962-02-01 Hartmann & Braun Ag Circuit arrangement for stabilizing the amplitude of self-excited vibration generators

Also Published As

Publication number Publication date
FR970485A (en) 1951-01-04

Similar Documents

Publication Publication Date Title
GB600004A (en) Improvements in or relating to multi-vibrator circuits
GB575395A (en) Improvements in or relating to electric oscillation generators
GB1285103A (en) Electrical measurement converter based on the two-wire principle
GB1010818A (en) Frequency standard
GB764861A (en) Improvements relating to square wave voltage generators
GB644083A (en) Improvements in or relating to electronic oscillation generators
US2374480A (en) Self-compensating amplifier tube circuit
SU129238A1 (en) Self-stabilizing amplifier for semiconductor triodes
GB628553A (en) Improvements in or relating to thermionic valve generators
SU120548A1 (en) Low Power Microwave Thermistor Indicator
SU122802A1 (en) Voltage Regulator
GB580626A (en) Improvements in electrical measuring devices
GB742505A (en) Improvements in and relating to voltage regulators
GB638064A (en) Improvements in or relating to electrical temperature control arrangements
GB559105A (en) Apparatus for the stabilization of alternating voltages
GB776407A (en) Improvements in or relating to lc-oscillators
GB558632A (en) Improvements in or relating to thermionic valve circuits
GB747035A (en) Improvements in and relating to electric valve oscillators for high frequency heating
GB589327A (en) Improvements in or relating to voltage supply circuits
GB700340A (en) Improvements in and relating to electric regulators
GB521828A (en) Improvements in and relating to voltage-regulating apparatus
GB682189A (en) Improvements in or relating to arrangements for varying the amplitude of generated oscillations
GB588714A (en) Improvements in or relating to thermionic valve apparatus
GB761546A (en) Improvements in or relating to voltage stabilising circuits
GB599080A (en) Improvements in and relating to the frequency control of multivibrators