GB1531716A - Electric control circuits - Google Patents

Electric control circuits

Info

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
Application number
GB4868574A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB4868574A priority Critical patent/GB1531716A/en
Publication of GB1531716A publication Critical patent/GB1531716A/en
Expired legal-status Critical Current

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.
GB4868574A 1975-10-31 1975-10-31 Electric control circuits Expired GB1531716A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (5)

* Cited by examiner, † Cited by third party
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