NL7503111A - Holding circuit maintaining potential in lead and used in alarm annunc - has PNP transistor across line with collector connected to NPN transistor base - Google Patents

Holding circuit maintaining potential in lead and used in alarm annunc - has PNP transistor across line with collector connected to NPN transistor base

Info

Publication number
NL7503111A
NL7503111A NL7503111A NL7503111A NL7503111A NL 7503111 A NL7503111 A NL 7503111A NL 7503111 A NL7503111 A NL 7503111A NL 7503111 A NL7503111 A NL 7503111A NL 7503111 A NL7503111 A NL 7503111A
Authority
NL
Netherlands
Prior art keywords
line
alarm
lead
resistance
transistor
Prior art date
Application number
NL7503111A
Other languages
Dutch (nl)
Original Assignee
Maximiliaan Wolff
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 Maximiliaan Wolff filed Critical Maximiliaan Wolff
Priority to NL7503111A priority Critical patent/NL7503111A/en
Publication of NL7503111A publication Critical patent/NL7503111A/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
    • H03K17/73—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for dc voltages or currents

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)

Abstract

The holding circuit is used for maintaining a potential in a lead when it is excited for a short period. Such a circuit is used in an alarm annunciator system, which will activate a line via alarm contacts when certain conditions such as fire etc. prevail. The line (1) connected to a supply (8) via a number of alarm switches (2, 3, 4) with the appropriate decoupling diodes (5, 6, 7). All the alarm contacts are open in the neutral condition, so that the line will not be live and the lamp or light emitting diode (9) which is connected via a series resistance (10) between the line and earth will remain extinguished. There is a transistor whose base is connected to the line via a resistance and whose emitter is connected to earth and collector to the supply via a resistance. There is also a second transistor of the opposite type conductivity whose base is connected to the collector of the first transistor via a resistance.
NL7503111A 1975-03-14 1975-03-14 Holding circuit maintaining potential in lead and used in alarm annunc - has PNP transistor across line with collector connected to NPN transistor base NL7503111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7503111A NL7503111A (en) 1975-03-14 1975-03-14 Holding circuit maintaining potential in lead and used in alarm annunc - has PNP transistor across line with collector connected to NPN transistor base

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7503111A NL7503111A (en) 1975-03-14 1975-03-14 Holding circuit maintaining potential in lead and used in alarm annunc - has PNP transistor across line with collector connected to NPN transistor base

Publications (1)

Publication Number Publication Date
NL7503111A true NL7503111A (en) 1976-09-16

Family

ID=19823378

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7503111A NL7503111A (en) 1975-03-14 1975-03-14 Holding circuit maintaining potential in lead and used in alarm annunc - has PNP transistor across line with collector connected to NPN transistor base

Country Status (1)

Country Link
NL (1) NL7503111A (en)

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