GB1086259A - Variable frequency oscillator - Google Patents
Variable frequency oscillatorInfo
- Publication number
- GB1086259A GB1086259A GB4549265A GB4549265A GB1086259A GB 1086259 A GB1086259 A GB 1086259A GB 4549265 A GB4549265 A GB 4549265A GB 4549265 A GB4549265 A GB 4549265A GB 1086259 A GB1086259 A GB 1086259A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- network
- amplifier
- impedances
- resistors
- 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
- H03B5/20—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
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
1,086,259. Resistance measurement. NEDERLANDSE ORGANISATIE VOOR TOEGEPASTNATUURWETENSCHAPPELIJK ONDERZOEK TEN BEHOEVE VAN NIJVERHEID, HANDEL EN VERKEER. Oct.27, 1965 [Oct.28, 1964], No. 45492/65. Heading G1U. [Also in Division H3] A resistance (e.g. a strain gauge) is measured by including it in a bridge which forms part of an oscillating loop comprising an amplifier and two R.C. phase-shift networks, one on each side of the bridge, wherein the R. C. network on the input side of the bridge is coupled thereto by two series impedances of the same kind in a diagonal of the bridge, the ratio of impedances being at balance, the same as the ratio of the bridge impedances with which they are in parallel. In Fig. 1 the R. C. network 14, 39 is coupled to two resistors 12, 13 across the bridge such that 8/9=10/11=12/13 at balance. The bridge output is fed through an amplifier 4 and transformer T 2 to a further R. C. network 24, 53 and thence via a further amplifier 6 and transformer T to the first R. C. network 14, 39. Variation in one of the resistors 8-11 alters the frequency of oscillation which can be measured on a meter M. A detailed circuit diagram is given Fig. 2 (not shown) for a mean operating frequency of 5 Kc/s.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6412569A NL6412569A (en) | 1964-10-28 | 1964-10-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1086259A true GB1086259A (en) | 1967-10-04 |
Family
ID=19791335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4549265A Expired GB1086259A (en) | 1964-10-28 | 1965-10-27 | Variable frequency oscillator |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE671480A (en) |
| DE (1) | DE1466197A1 (en) |
| GB (1) | GB1086259A (en) |
| NL (1) | NL6412569A (en) |
-
1964
- 1964-10-28 NL NL6412569A patent/NL6412569A/xx unknown
-
1965
- 1965-10-21 DE DE19651466197 patent/DE1466197A1/en active Pending
- 1965-10-27 GB GB4549265A patent/GB1086259A/en not_active Expired
- 1965-10-27 BE BE671480D patent/BE671480A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE1466197A1 (en) | 1969-06-12 |
| BE671480A (en) | 1966-04-27 |
| NL6412569A (en) | 1966-04-29 |
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