GB1096133A - Improvements in and relating to alarms - Google Patents

Improvements in and relating to alarms

Info

Publication number
GB1096133A
GB1096133A GB2273765A GB2273765A GB1096133A GB 1096133 A GB1096133 A GB 1096133A GB 2273765 A GB2273765 A GB 2273765A GB 2273765 A GB2273765 A GB 2273765A GB 1096133 A GB1096133 A GB 1096133A
Authority
GB
United Kingdom
Prior art keywords
integrator
diode
detector
emitter follower
alarm
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
GB2273765A
Inventor
John Henry Lee
Roy Stockdale
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.)
Security Monitoring Centres Ltd
Original Assignee
Burgot Automatic Alarms Ltd
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 Burgot Automatic Alarms Ltd filed Critical Burgot Automatic Alarms Ltd
Priority to GB2273765A priority Critical patent/GB1096133A/en
Publication of GB1096133A publication Critical patent/GB1096133A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

1,096,133. Transistor switching circuits. BURGOT AUTOMATIC ALARMS Ltd. May 27, 1966 [May 28, 1965], No. 22737/65. Heading H3T. [Also in Division G4] Alarm signals from a vibration transducer, e.g. a microphone VT pass through a three-stage transistorized amplifier VT1, VT2, VT3 to an emitter follower detector VT4 and an integrator VT5 having a storage capacitor C13 which charges up until it reaches the voltage at which unijunction transistor VT6 conducts to block VT7 and actuate an alarm. When the detector is initially switched on a false signal may be sent to emitter follower VT4. This is obviated by by-passing output from VT3 through a reset circuit consisting of diode MR1, capacitor C11 and resistor R15. The integrator has a decaying memory of about 10 minutes. A diode MR2 is provided to discharge the memory circuit when switching on the device.
GB2273765A 1965-05-28 1965-05-28 Improvements in and relating to alarms Expired GB1096133A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2273765A GB1096133A (en) 1965-05-28 1965-05-28 Improvements in and relating to alarms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2273765A GB1096133A (en) 1965-05-28 1965-05-28 Improvements in and relating to alarms

Publications (1)

Publication Number Publication Date
GB1096133A true GB1096133A (en) 1967-12-20

Family

ID=10184289

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2273765A Expired GB1096133A (en) 1965-05-28 1965-05-28 Improvements in and relating to alarms

Country Status (1)

Country Link
GB (1) GB1096133A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003985A1 (en) * 1985-12-17 1987-07-02 Weyrad (Electronics) Limited Improvements relating to alarm systems
GB2191324A (en) * 1986-05-29 1987-12-09 Cadin Electronics Security alarm system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987003985A1 (en) * 1985-12-17 1987-07-02 Weyrad (Electronics) Limited Improvements relating to alarm systems
EP0234116A1 (en) * 1985-12-17 1987-09-02 Weyrad (Electronics) Ltd Alarm system
US4912455A (en) * 1985-12-17 1990-03-27 Weyrad (Electronics) Limited Alarm systems
GB2191324A (en) * 1986-05-29 1987-12-09 Cadin Electronics Security alarm system
GB2191324B (en) * 1986-05-29 1990-05-23 Cadin Electronics Security alarm systems

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