The vehicle headlight monitor

Published:2011/7/23 4:08:00 Author:qqtang | Keyword: headlight monitor | From:SeekIC

The working principle of the circuit The vehicle headlight monitor circuit consists of the light sensitive transistor V1, transistors of V2 and V3, buzzer HA, LED VL and so on, see as figure 7-64. At daytime, the phototransistor V1 is in a low LEV due to the light, so V2 is blocked due to the low LEV of its basic pole. If the driver forgets to shut off the headlight or mistakenly turn on the headlight, the basic pole of V3 will be in a low LEV, which makes V2 conducting, the buzzer HA is emitting the alarm sound, meanwhile, the LED VL is glowing.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Automotive_Circuit/The_vehicle_headlight_monitor.html

Print this Page | Comments | Reading(3)