Wednesday, March 5, 2014

Wiring Diagram Automatic Car Headlight Dim Switch System

RealAutoTips. - There are many electronic circuit schematic that can help us to modify our car or complete our car with accessories as like car audio. And we now that many advanced car that supported with electronic technology.

In this time we want to share with you about Wiring Diagram Automatic Car Headlight Dim Switch System that we hope can help you to build headlight dim for your car that can you build by your self. To know more the Wiring Diagram Automatic Car Headlight Dim Switch System please see figure 1 below.

Wiring Diagram

Figure 1. Wiring Diagram Automatic Car Headlight Dim Switch System (Circuitstoday)

Component List
  1. Q1 ------ BC177
  2. Q2 ------ PhotoTransistor
  3. R1 ------ 10K
  4. R2 ------ 10K
  5. R3 ------ 4K7
  6. R4 ------ 10K
  7. B1 ------ 12V


With this cool circuit integrated to your cars headlight system , you can drive cool headed in high beam.The circuit will take over the duty of low beaming the headlight when vehicles approach against , and high beams the lights when they pass over. 

The circuit is based on a photo transistor(Q1) for sensing the approaching vehicles and transistor Q2 (BC177) for switching the relays for controlling the headlight.When the light from the opposite vehicle falls on Q2 , it’s collector current increases and turns ON Q1.The relay will be activated and the head light will be dimmed.When the vehicle pass over the reverse will happen. (Circuitstoday)

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