GB958865A - Electrical protection system - Google Patents

Electrical protection system

Info

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
Application number
GB33815/62A
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.)
American District Telegraph Co
Original Assignee
American District Telegraph Co
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 American District Telegraph Co filed Critical American District Telegraph Co
Publication of GB958865A publication Critical patent/GB958865A/en
Expired legal-status Critical Current

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.
GB33815/62A 1961-09-07 1962-09-04 Electrical protection system Expired GB958865A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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