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GB1186044A - Alarm Circuit - Google Patents

Alarm Circuit

Info

Publication number
GB1186044A
GB1186044A GB1906367A GB1906367A GB1186044A GB 1186044 A GB1186044 A GB 1186044A GB 1906367 A GB1906367 A GB 1906367A GB 1906367 A GB1906367 A GB 1906367A GB 1186044 A GB1186044 A GB 1186044A
Authority
GB
United Kingdom
Prior art keywords
transistor
alarm circuit
khz
division
rectified
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
GB1906367A
Inventor
Robert Richard Clark
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.)
ELECTRONIC LAB Ltd FORMERLY EL
Original Assignee
ELECTRONIC LAB Ltd FORMERLY EL
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 ELECTRONIC LAB Ltd FORMERLY EL filed Critical ELECTRONIC LAB Ltd FORMERLY EL
Priority to GB1906367A priority Critical patent/GB1186044A/en
Publication of GB1186044A publication Critical patent/GB1186044A/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
    • G08B13/02—Mechanical actuation
    • G08B13/04—Mechanical actuation by breaking of glass

Landscapes

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

Abstract

1,186,044. Transistor monostable circuit. ELECTRONIC LABORATORIES Ltd. 25 April, 1967, No. 19063/67. Heading H3T. [Also in Division G4] In an alarm system (see Division G4) 5 kHz signals from a transducer X are rectified at 12 and turn on transistor 20, turning off transistor 18. The conductive states of the transistors are restored after a time dependent on components 24, 26. Capacitor 14 filters out frequencies above 5 kHz.
GB1906367A 1967-04-25 1967-04-25 Alarm Circuit Expired GB1186044A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1906367A GB1186044A (en) 1967-04-25 1967-04-25 Alarm Circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1906367A GB1186044A (en) 1967-04-25 1967-04-25 Alarm Circuit

Publications (1)

Publication Number Publication Date
GB1186044A true GB1186044A (en) 1970-04-02

Family

ID=10123158

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1906367A Expired GB1186044A (en) 1967-04-25 1967-04-25 Alarm Circuit

Country Status (1)

Country Link
GB (1) GB1186044A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2260352A1 (en) * 1971-12-10 1973-06-28 Microwave & Electronic Syst DEVICE FOR DETECTION OF DAMAGE TO GLASS PANELS OR SIMILAR
DE2254540A1 (en) * 1972-11-08 1974-05-09 Wilhelm Karger VIBRATION DETECTORS FOR QUIET POWER SYSTEMS
FR2312827A1 (en) * 1975-05-29 1976-12-24 Matsushita Electric Industrial Co Ltd GLASS BREAK DETECTOR
DE3043912A1 (en) * 1980-11-21 1982-07-01 alfasystem GmbH Vertrieb von elektronischen Sicherheitssystemen, 8034 Germering Glass breakage detector - uses piezoelectric break noise sensor coupled to detector circuit with protection against false triggering
DE3121705A1 (en) * 1980-11-21 1982-12-16 alfasystem GmbH Vertrieb von elektronischen Sicherheitssystemen, 8034 Germering Glass breakage detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2260352A1 (en) * 1971-12-10 1973-06-28 Microwave & Electronic Syst DEVICE FOR DETECTION OF DAMAGE TO GLASS PANELS OR SIMILAR
DE2254540A1 (en) * 1972-11-08 1974-05-09 Wilhelm Karger VIBRATION DETECTORS FOR QUIET POWER SYSTEMS
FR2312827A1 (en) * 1975-05-29 1976-12-24 Matsushita Electric Industrial Co Ltd GLASS BREAK DETECTOR
DE3043912A1 (en) * 1980-11-21 1982-07-01 alfasystem GmbH Vertrieb von elektronischen Sicherheitssystemen, 8034 Germering Glass breakage detector - uses piezoelectric break noise sensor coupled to detector circuit with protection against false triggering
DE3121705A1 (en) * 1980-11-21 1982-12-16 alfasystem GmbH Vertrieb von elektronischen Sicherheitssystemen, 8034 Germering Glass breakage detector

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee