FR2284155A1 - Central circuit for burglary alarm control - has level detector conducting when control capacitor voltage above set level - Google Patents
Central circuit for burglary alarm control - has level detector conducting when control capacitor voltage above set levelInfo
- Publication number
- FR2284155A1 FR2284155A1 FR7430676A FR7430676A FR2284155A1 FR 2284155 A1 FR2284155 A1 FR 2284155A1 FR 7430676 A FR7430676 A FR 7430676A FR 7430676 A FR7430676 A FR 7430676A FR 2284155 A1 FR2284155 A1 FR 2284155A1
- Authority
- FR
- France
- Prior art keywords
- capacitor
- level
- control
- capacitor voltage
- above set
- 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.)
- Withdrawn
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
- G08B25/14—Central alarm receiver or annunciator arrangements
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The output current which actuates the alarm during a predetermined period is obtained by means of a capacitor whose charge time constant is low and whose discharge time constant is long. The capacitor is associated with a level detector which is conducting when the voltage at the terminals of the capacitor is greater than the detector level. A delay before alarm actuation to allow a person to neutralize the system is produced by a comparator only delivering a current after a capacitor charging, the capacitor being charged slowly through a high value resistor and a further capacitor which is rapidly charged.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7430676A FR2284155A1 (en) | 1974-09-04 | 1974-09-04 | Central circuit for burglary alarm control - has level detector conducting when control capacitor voltage above set level |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7430676A FR2284155A1 (en) | 1974-09-04 | 1974-09-04 | Central circuit for burglary alarm control - has level detector conducting when control capacitor voltage above set level |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2284155A1 true FR2284155A1 (en) | 1976-04-02 |
Family
ID=9142942
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7430676A Withdrawn FR2284155A1 (en) | 1974-09-04 | 1974-09-04 | Central circuit for burglary alarm control - has level detector conducting when control capacitor voltage above set level |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2284155A1 (en) |
-
1974
- 1974-09-04 FR FR7430676A patent/FR2284155A1/en not_active Withdrawn
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |