GB1531716A - Electric control circuits - Google Patents
Electric control circuitsInfo
- Publication number
- GB1531716A GB1531716A GB4868574A GB4868574A GB1531716A GB 1531716 A GB1531716 A GB 1531716A GB 4868574 A GB4868574 A GB 4868574A GB 4868574 A GB4868574 A GB 4868574A GB 1531716 A GB1531716 A GB 1531716A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switched
- switching circuit
- switch
- timing
- pulse
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/84—Generating pulses having a predetermined statistical distribution of a parameter, e.g. random pulse generators
-
- 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
- H03K17/725—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 ac voltages or currents
Landscapes
- Burglar Alarm Systems (AREA)
Abstract
1531716 Switching circuits for lighting systems S KELLY 31 Oct 1975 [11 Nov 1974 14 May 1975] 48685/74 and 20239/75 Heading H2H A switching circuit for controlling the lighting of an unoccupied house or building to discourage intruders comprises a timing circuit 30-32 which operates a switch 33 at random intervals. The switching circuit may be incorporated in the base 20 of a lamp 19 and includes a timing device 30 which sets a flip flop 31 every 23 minutes as well as a timing device 32 which resets the flip flop every 29 minutes. The switch 33, which may be a triac, a thyristor or a mechanical switch, is therefore switched on by each pulse from the device 30 and switched off by each pulse from the device 32 so that the lamp is switched on and off for random intervals of time. A photosensitive device is mounted behind an aperture 24 to prevent operation of the switching circuit during the hours of daylight.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4868574A GB1531716A (en) | 1975-10-31 | 1975-10-31 | Electric control circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4868574A GB1531716A (en) | 1975-10-31 | 1975-10-31 | Electric control circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1531716A true GB1531716A (en) | 1978-11-08 |
Family
ID=10449550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4868574A Expired GB1531716A (en) | 1975-10-31 | 1975-10-31 | Electric control circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1531716A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2135839A (en) * | 1983-02-24 | 1984-09-05 | Rubio Felipe Bonilla | Switch assembly with adjustable timing for use in lighting entrances and stairways |
GB2144002A (en) * | 1983-07-16 | 1985-02-20 | Malcolm Henry Charles Moore | Domestic electrical wiring system |
GB2190803A (en) * | 1986-05-20 | 1987-11-25 | Yong Kin Michael Ong | Light-dependent timer switching system |
GB2233789A (en) * | 1989-05-04 | 1991-01-16 | Dolphin Hitec Limited | Electronic security apparatus |
GB2276049A (en) * | 1992-12-18 | 1994-09-14 | Concorde Security Syst Ltd | Intruder deterrent lamp-control device |
-
1975
- 1975-10-31 GB GB4868574A patent/GB1531716A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2135839A (en) * | 1983-02-24 | 1984-09-05 | Rubio Felipe Bonilla | Switch assembly with adjustable timing for use in lighting entrances and stairways |
GB2144002A (en) * | 1983-07-16 | 1985-02-20 | Malcolm Henry Charles Moore | Domestic electrical wiring system |
GB2190803A (en) * | 1986-05-20 | 1987-11-25 | Yong Kin Michael Ong | Light-dependent timer switching system |
GB2233789A (en) * | 1989-05-04 | 1991-01-16 | Dolphin Hitec Limited | Electronic security apparatus |
GB2276049A (en) * | 1992-12-18 | 1994-09-14 | Concorde Security Syst Ltd | Intruder deterrent lamp-control device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee | ||
728C | Application made for restoration (sect. 28/1977) | ||
728A | Order made restoring the patent (sect. 28/1977) | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |