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 baseInfo
- 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
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.
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) |
-
1975
- 1975-03-14 NL NL7503111A patent/NL7503111A/en unknown
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB1401146A (en) | Fire alarm system with remote central station | |
US3631393A (en) | Vehicle lamp failure warning system having warning circuit completed when lamp is off | |
GB924470A (en) | Improvements in or relating to transistor circuits | |
SE330659B (en) | ||
NL7503111A (en) | Holding circuit maintaining potential in lead and used in alarm annunc - has PNP transistor across line with collector connected to NPN transistor base | |
GB1308693A (en) | Circuit arrangement for indicating the failure of a lamp | |
GB1243836A (en) | Radiation monitoring device | |
GB910920A (en) | Improvements in or relating to fire-detection circuits | |
GB1358610A (en) | Electronic threshold switch | |
GB1402253A (en) | Lamp failure warning circuits | |
MY107197A (en) | Semiconductor integrating circuit. | |
GB934556A (en) | Improvements in or relating to temperature-responsive devices | |
GB954116A (en) | Stand-by lamp circuits | |
GB910045A (en) | Improvements in shot exploders | |
FR2290818A1 (en) | Miniature electronic flasher eg incorporated in jewellery item - uses two transistors of complementary type energising appropriate light sources | |
KR850001658Y1 (en) | The warning circuit for gas combustion apparatus | |
FR2309121A7 (en) | DC supply circuits currency interruption alarm system - uses electro-luminescent diodes to control conduction of transistor which causes relay operation | |
KR870000812A (en) | Busy Indicator on the Phone | |
ES347650A1 (en) | Lamp Failure Warning Circuit | |
SU469963A1 (en) | Load current detector | |
JPS5320880A (en) | Driving circuit of light emitting diode | |
SU503267A1 (en) | Flame detector | |
JPS5466877A (en) | Light emitting diode level meter circuit | |
SU1582876A3 (en) | DEVICE FOR SECURITY ALARM | |
GB1342248A (en) | Electrical lamp failure indicating circuits |