ES479659A1 - Un circuito electrico de alarma. - Google Patents

Un circuito electrico de alarma.

Info

Publication number
ES479659A1
ES479659A1 ES479659A ES479659A ES479659A1 ES 479659 A1 ES479659 A1 ES 479659A1 ES 479659 A ES479659 A ES 479659A ES 479659 A ES479659 A ES 479659A ES 479659 A1 ES479659 A1 ES 479659A1
Authority
ES
Spain
Prior art keywords
tamper
line
circuit
current
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
ES479659A
Other languages
English (en)
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.)
Chubb Electronics Ltd
Original Assignee
Chubb Electronics 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 Chubb Electronics Ltd filed Critical Chubb Electronics Ltd
Publication of ES479659A1 publication Critical patent/ES479659A1/es
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)

Abstract

Un circuito eléctrico de alarma en el que hay un cambio de condición de señal eléctrica en una primera o una segunda de dos líneas de señalización según, respectivamente, que exista una primera o una segunda condición de alarma, en el cual el camino o circuito de base-emisor de un transistor está conectado entre las líneas de señalización primera y segunda de tal modo que la corriente de colector-emisor del transistor establece una primera componente de paso de corriente en la segunda línea de señalización cambio que es aplicado en el circuito de colector del transistor en respuesta a la aparición de la primera condición de alarma, aumenta la corriente de base-emisor del transistor y con ello aumenta también la magnitud del paso de corriente en la primera línea de señalización, para así mantener el paso de dicha primera componente en la segunda línea de señalización.
ES479659A 1978-04-17 1979-04-17 Un circuito electrico de alarma. Expired ES479659A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1507078 1978-04-17

Publications (1)

Publication Number Publication Date
ES479659A1 true ES479659A1 (es) 1979-10-16

Family

ID=10052507

Family Applications (1)

Application Number Title Priority Date Filing Date
ES479659A Expired ES479659A1 (es) 1978-04-17 1979-04-17 Un circuito electrico de alarma.

Country Status (3)

Country Link
EP (1) EP0005046B1 (es)
DE (1) DE2962120D1 (es)
ES (1) ES479659A1 (es)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622541A (en) * 1984-01-09 1986-11-11 Napco Security Systems, Inc. Intrusion detection system
DE19505794C1 (de) * 1995-02-09 1996-08-08 Siemens Ag Schaltungsanordnung zur Übermittlung von wenigstens zwei Meldesignalen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3997889A (en) * 1974-01-30 1976-12-14 Sharp Kabushiki Kaisha Alarm system for indicating a fault condition of an anti-skid braking control system
DE2621209B1 (de) * 1976-05-13 1977-07-28 Preussag Ag Feuerschutz Meldeeinrichtung,insbesondere zur Brandmeldung

Also Published As

Publication number Publication date
EP0005046A1 (en) 1979-10-31
EP0005046B1 (en) 1982-02-17
DE2962120D1 (en) 1982-03-25

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