The circuit described, for a car interior light delay switch, is designed for permanent addition to the car wiring system without having to break any wires in the existing harness. Other features include low quiescent current consumption - less than 100 muA, solid state switching, and an abort facility if the door is reopened during the timing cycle. The circuit is designed around the CMOS 555 time package. The device is suitable only for NEGATIVE ground vehicles with a +12 volt battery supply and with ground line door switches. Samples of the design have been fitted to British and foreign cars, and they have shown total reliability over a period of six months.
Car interior light delay switch
Verzoegerungsschaltung fuer Kfz-Innenbeleuchtung
Practical Electronics ; 20 , 4 ; 36-37
1984
2 Seiten
Article (Journal)
English