13-02-2017, 11:33 AM
This parking light switch with LDR automatically turns on the light when the surrounding light is dimmed to a preset level. The first circuit diagram is an NPN design designed for a negative grounded chassis. The second diagram is the PNP version intended for a positive grounded chassis.
The current level at which the circuit is activated is set via the potentiometer P1.
The layout of the printed circuit board can be used for both the negative and positive polarity chassis. Take into account that transistors and different for each type of chassis. The connectors labeled on the part placement diagram have the following connections:
P = Live car power
C = Car chassis
B = Park light bulb
The current level at which the circuit is activated is set via the potentiometer P1.
The layout of the printed circuit board can be used for both the negative and positive polarity chassis. Take into account that transistors and different for each type of chassis. The connectors labeled on the part placement diagram have the following connections:
P = Live car power
C = Car chassis
B = Park light bulb