GB958865A - Electrical protection system - Google Patents
Electrical protection systemInfo
- Publication number
- GB958865A GB958865A GB33815/62A GB3381562A GB958865A GB 958865 A GB958865 A GB 958865A GB 33815/62 A GB33815/62 A GB 33815/62A GB 3381562 A GB3381562 A GB 3381562A GB 958865 A GB958865 A GB 958865A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- base
- circuit
- diode
- collector
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
- G08B13/1672—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using sonic detecting means, e.g. a microphone operating in the audio frequency range
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
- Burglar Alarm Systems (AREA)
Abstract
958,865. Transistor amplifier circuits and switching. AMERICAN DISTRICT TELEGRAPH CO. Sept. 4, 1962 [Sept. 7, 1961], No. 33815/62. Heading H3T. [Also in Division G4] A low noise transistor amplifier used in an electrical protection system (see Division G4), has its input supplied via a transformer 44 to the base of the first of six NPN transistors 47- 52, the output being taken from the collector of transistor 52. The transistors are directly collector-base coupled, and each has a resistor 79-83 giving feedback from its collector to base. The overall amplifier is provided with negative feedback via a PNP transistor 74 and a resistor 53. To ensure that the amplifier gives greater amplification in the range 3- 10 kc/s., resistors 84, 85 and condenser 86. are included giving greater feedback at frequencies below 3 kc/s. and condenser 87 is included, giving greater feedback above 10 kc/s. The circuit may be energized from an A.C. supply through the rectifiers 61-64 stabilized by the Zener diode 65. Also included in the system is a unijunction transistor or double-based diode 99 (see Fig. 5), to the emitter of which is applied a voltage derived either from an integrator and differentiator circuit through a diode 96 or through a diode 103 from a low-gain wide band amplifier including the transistors 106, 112. The double-base diode conducts when the voltage between its emitter and base B1 exceeds a certain percentage (about 60) of the voltage between the two bases B1 and B2, and the coil 97 of a relay in the emitter circuit is then actuated so that an alarm signal may be given when the voltage input to the circuit exceeds a predetermined value. An alternative arrangement to this is described (Fig. 6, not shown), using a field effect transistor, with the relay coil in the collector circuit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US136487A US3147467A (en) | 1961-09-07 | 1961-09-07 | Vibration detection vault alarm system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB958865A true GB958865A (en) | 1964-05-27 |
Family
ID=22473067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB33815/62A Expired GB958865A (en) | 1961-09-07 | 1962-09-04 | Electrical protection system |
Country Status (2)
Country | Link |
---|---|
US (1) | US3147467A (en) |
GB (1) | GB958865A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2352351A1 (en) * | 1976-05-17 | 1977-12-16 | Matsushita Electric Works Ltd | DETECTION DEVICE TO DETECT VIBRATIONS OF A DESTRUCTIVE NATURE IN STRUCTURES |
GB2295230A (en) * | 1994-10-05 | 1996-05-22 | Cqr Security Components Ltd | Shock sensor apparatus and method |
Families Citing this family (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3296587A (en) * | 1963-02-20 | 1967-01-03 | Texas Instruments Inc | Intrusion detector system |
US3276006A (en) * | 1964-02-27 | 1966-09-27 | Mosler Res Products Inc | Audio accumulator |
US3273138A (en) * | 1964-04-28 | 1966-09-13 | Sonus Corp | Swimming pool monitor |
US3364477A (en) * | 1965-02-15 | 1968-01-16 | American District Telegraph Co | Vault alarm system |
US3415517A (en) * | 1965-10-18 | 1968-12-10 | Krist Henry Kelvin | Automatic impact indicator system for tennis |
US3487396A (en) * | 1966-03-11 | 1969-12-30 | Franklin M Perelman | Intrusion vibration detector with ambient noise compensator |
US3517316A (en) * | 1966-03-22 | 1970-06-23 | Res Instr & Controls Inc | Surveillance equipment and system |
US3569923A (en) * | 1967-10-30 | 1971-03-09 | Us Navy | Adaptive acoustic detector apparatus |
US3634843A (en) * | 1968-10-14 | 1972-01-11 | Product Dev Services Inc | Circuit and method for detecting localized noise level changes and especially electromagnetic noise |
US3579220A (en) * | 1969-03-28 | 1971-05-18 | Automatic Sprinkler Corp | Alarm system |
US4975891A (en) * | 1970-02-13 | 1990-12-04 | The United States Of America As Represented By The Secretary Of The Navy | Vehicle sensing device and method |
US5054006A (en) * | 1970-02-19 | 1991-10-01 | The United States Of America As Represented By The Secretary Of The Navy | Seismic-acoustic detection device |
US3713128A (en) * | 1970-08-07 | 1973-01-23 | Systron Donner Corp | Vault alarm system and method |
US3696369A (en) * | 1970-12-02 | 1972-10-03 | Sylvania Electric Prod | Signal processor |
US4122432A (en) * | 1971-03-30 | 1978-10-24 | Fried. Krupp Gesellschaft Mit Beschrankter Haftung Atlas Elektronik Bremen | Device for identifying noise sources |
US4054867A (en) * | 1971-12-10 | 1977-10-18 | Microwave And Electronic Systems Limited | Detecting damage to bulk material |
US3889250A (en) * | 1973-10-15 | 1975-06-10 | Gulf & Western Mfg Co | Active frequency-responsive glass breakage detector |
DE2755150A1 (en) * | 1977-12-10 | 1979-06-13 | Ristow Kg Dr Alfred | Body vibration detector for alarms - has inbuilt suppressor for environmental disturbance effects and permits abnormal sounds to pass through |
CH643078A5 (en) * | 1978-11-30 | 1984-05-15 | Cerberus Ag | PROCESS AND ARRANGEMENT FOR THE BURGLAR REPORT. |
DE2852664C2 (en) * | 1978-12-06 | 1982-08-19 | Cerberus AG, 8708 Männedorf, Zürich | Procedure and arrangement for intrusion detection |
JPS5942609B2 (en) * | 1980-10-31 | 1984-10-16 | 日立造船株式会社 | Centrifugal molding device for trapezoidal resin tube with roving |
DE3221997A1 (en) * | 1982-06-11 | 1983-12-15 | Securiton AG, 3052 Zollikofen, Bern | DEVICE FOR MONITORING ARMORED ROOMS, ESPECIALLY SAFE AND CABINETS, AND FOR GENERATING AN ALARM SIGNAL WHEN A BURGLAR ATTEMPT IS TAKEN |
US11070049B2 (en) | 2017-11-08 | 2021-07-20 | Eaton Intelligent Power Limited | System, method, and apparatus for power distribution in an electric mobile application using a combined breaker and relay |
US11052784B2 (en) | 2017-11-08 | 2021-07-06 | Eaton Intelligent Power Limited | Power distribution unit and fuse management for an electric mobile application |
US11108225B2 (en) | 2017-11-08 | 2021-08-31 | Eaton Intelligent Power Limited | System, method, and apparatus for power distribution in an electric mobile application using a combined breaker and relay |
US11368031B2 (en) | 2017-11-08 | 2022-06-21 | Eaton Intelligent Power Limited | Power distribution and circuit protection for a mobile application having a high efficiency inverter |
US11689010B2 (en) | 2019-02-22 | 2023-06-27 | Eaton Intelligent Power Limited | Coolant fitting promoting turbulent flow |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2400571A (en) * | 1943-02-26 | 1946-05-21 | Cons Eng Corp | Electrical measurement |
US2455376A (en) * | 1944-01-05 | 1948-12-07 | American District Telegraph Co | Capacity alarm system |
US2623931A (en) * | 1947-09-26 | 1952-12-30 | Alertronic Protective Corp Of | Circuit for detection of frequency differences and apparatus employing same |
US2767393A (en) * | 1953-08-03 | 1956-10-16 | Kidde & Co Walter | Approach alarm system with unwanted signal elimination |
US2942247A (en) * | 1956-11-06 | 1960-06-21 | Carl C Lienau | Alarm warning system for swimming pools |
US2903683A (en) * | 1957-02-25 | 1959-09-08 | Kidde & Co Walter | Sensitivity control of apparatus for detecting disturbances in an enclosure |
-
1961
- 1961-09-07 US US136487A patent/US3147467A/en not_active Expired - Lifetime
-
1962
- 1962-09-04 GB GB33815/62A patent/GB958865A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2352351A1 (en) * | 1976-05-17 | 1977-12-16 | Matsushita Electric Works Ltd | DETECTION DEVICE TO DETECT VIBRATIONS OF A DESTRUCTIVE NATURE IN STRUCTURES |
GB2295230A (en) * | 1994-10-05 | 1996-05-22 | Cqr Security Components Ltd | Shock sensor apparatus and method |
Also Published As
Publication number | Publication date |
---|---|
US3147467A (en) | 1964-09-01 |
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