GB954116A - Stand-by lamp circuits - Google Patents

Stand-by lamp circuits

Info

Publication number
GB954116A
GB954116A GB976062A GB976062A GB954116A GB 954116 A GB954116 A GB 954116A GB 976062 A GB976062 A GB 976062A GB 976062 A GB976062 A GB 976062A GB 954116 A GB954116 A GB 954116A
Authority
GB
United Kingdom
Prior art keywords
transistor
lamp
conductive
auxiliary lamp
auxiliary
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
GB976062A
Inventor
Anthony Cyril Evans
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.)
Lucas Support Services Ltd
Original Assignee
Rotax Ltd
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 Rotax Ltd filed Critical Rotax Ltd
Priority to GB976062A priority Critical patent/GB954116A/en
Publication of GB954116A publication Critical patent/GB954116A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/10—Circuits providing for substitution of the light source in case of its failure
    • H05B39/105—Circuits providing for substitution of the light source in case of its failure with a spare lamp in the circuit, and a possibility of shunting a failed lamp

Landscapes

  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

954,116. Standby lighting arrangements. ROTAX Ltd. Feb. 25, 1963 [March 14, 1962], No. 9760/62. Heading H2H. A standby lighting system comprising a main lamp 12 and an auxiliary lamp 11 has the main lamp connected in the base circuit of a transistor 8 so that when the lamp is illuminated the current flow renders the transistor 8 conductive over a resistor 11 thereby holding a second transistor 9 non-conductive to prevent illumination of the auxiliary lamp 11. Failure of the main lamp 12 removes the base current of the transistor 8 which then becomes non- conductive rendering transistor 9 conductive to illuminate the auxiliary lamp 11. The transistors may be PNP or NPN or of dissimilar kinds and the auxiliary lamp may be in the emitter circuit of the associated transistor.
GB976062A 1962-03-14 1962-03-14 Stand-by lamp circuits Expired GB954116A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB976062A GB954116A (en) 1962-03-14 1962-03-14 Stand-by lamp circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB976062A GB954116A (en) 1962-03-14 1962-03-14 Stand-by lamp circuits

Publications (1)

Publication Number Publication Date
GB954116A true GB954116A (en) 1964-04-02

Family

ID=9878258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB976062A Expired GB954116A (en) 1962-03-14 1962-03-14 Stand-by lamp circuits

Country Status (1)

Country Link
GB (1) GB954116A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671955A (en) * 1970-03-30 1972-06-20 Master Specialties Co Lamp failure detection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671955A (en) * 1970-03-30 1972-06-20 Master Specialties Co Lamp failure detection circuit

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