GB946362A - Lamp switching circuit - Google Patents

Lamp switching circuit

Info

Publication number
GB946362A
GB946362A GB3785361A GB3785361A GB946362A GB 946362 A GB946362 A GB 946362A GB 3785361 A GB3785361 A GB 3785361A GB 3785361 A GB3785361 A GB 3785361A GB 946362 A GB946362 A GB 946362A
Authority
GB
United Kingdom
Prior art keywords
switching circuit
lamp switching
lamps
oct
standby lighting
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
GB3785361A
Inventor
Harold William Cliff Pilling
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.)
Chamberlain and Hookham Ltd
Original Assignee
Chamberlain and Hookham 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 Chamberlain and Hookham Ltd filed Critical Chamberlain and Hookham Ltd
Priority to GB3785361A priority Critical patent/GB946362A/en
Publication of GB946362A publication Critical patent/GB946362A/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

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

946,362. Standby lighting systems. CHAMBERLAIN & HOOKHAM Ltd. Oct. 10, 1962 [Oct. 23, 1961], No. 37853/61. Heading H2H. A standby lighting system comprises two lamps L1, L2 connected in a bridge circuit including resistors R1, R2 and a Zener diode Z, the terminals 1, 3 of the bridge being connected to a D.C. source. Thus should a lamp fail the other will become illuminated. As described the lamps are used for energizing a photosensitive device.
GB3785361A 1961-10-23 1961-10-23 Lamp switching circuit Expired GB946362A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3785361A GB946362A (en) 1961-10-23 1961-10-23 Lamp switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3785361A GB946362A (en) 1961-10-23 1961-10-23 Lamp switching circuit

Publications (1)

Publication Number Publication Date
GB946362A true GB946362A (en) 1964-01-15

Family

ID=10399477

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3785361A Expired GB946362A (en) 1961-10-23 1961-10-23 Lamp switching circuit

Country Status (1)

Country Link
GB (1) GB946362A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4572987A (en) * 1983-03-11 1986-02-25 Ab Electronic Components Limited Lamp monitoring circuit
US4808975A (en) * 1986-03-20 1989-02-28 Licentia Patent-Verwaltungs-Gmbh Arrangement for checking and indicating the malfunction of a lamp in monitoring and switching systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4572987A (en) * 1983-03-11 1986-02-25 Ab Electronic Components Limited Lamp monitoring circuit
US4808975A (en) * 1986-03-20 1989-02-28 Licentia Patent-Verwaltungs-Gmbh Arrangement for checking and indicating the malfunction of a lamp in monitoring and switching systems

Similar Documents

Publication Publication Date Title
GB924470A (en) Improvements in or relating to transistor circuits
SE304310B (en)
GB946362A (en) Lamp switching circuit
GB1308693A (en) Circuit arrangement for indicating the failure of a lamp
GB946496A (en) Lamp switching circuit
GB884832A (en) Improvements in or relating to telephone subscriber's line circuits
ES2027290T3 (en) CALL CURRENT CIRCUIT.
FR1301744A (en) Contactless lighting device
GB985008A (en) Static switching circuits
GB923878A (en) Control means for flashing electric signal lamp systems
GB960991A (en) Improvements in or relating to tunnel diode circuit arrangements
GB954116A (en) Stand-by lamp circuits
CA592416A (en) Ballast and lighting system for fluororescent lamps
GB1096390A (en) Illuminatable, inflatable, globes
GB1060482A (en) Improvements in or relating to vehicle lighting systems
GB936962A (en) Improvements in and relating to switching means for electric circuits
KR860002184A (en) Time limit switch
CA599179A (en) Printed circuit lamp base
CA618618A (en) High output lighting system for a fluorescent lamp
ES332963A1 (en) System indicator of interrupted fuses. (Machine-translation by Google Translate, not legally binding)
CA595342A (en) Lighting fitting for road illumination
CA598195A (en) Lamp control circuit
CA608773A (en) Lamp socket with printed circuit mounting
CA603652A (en) Emergency lighting system
GB881396A (en) Improvements in or relating to vehicle signalling circuits