[Menu]>[Application]>[Circuit Idea for the Car]
Head lamp turn on dimly
If you choose to quote any information found within the pages of this website, you do so at your own risk.
The author accepts absolutely no responsibility for any loss or damages
occurring from the use of the information contained by this website.
In Japan when the momentary stop is done with intersection at night, the head lamp is turned off.
The circuit where I introduce here is the circuit where turns on the head lamp dimly instead of having turned off it completely when the tail lamp is turning on.
There are 2 purpose in this.
The 1st is because it extends the life of the head lamp.
As for the head lamp of the recent car the halogen lamp is used a lot. Halogen has a characteristic to return the filament of lamp that evaporates by heat to the original one.
Yet, a large current flows at the time of illumination and the filament of lamp sometimes cuts. The life of the lamp extends by being gradually lighted.
When it turns off temporarily, the halogen lamp is good to turn on be dim.
The 2nd is to become instead of a position light.
Thin light condition in the evening, I think that it is good the shape as a position lamp.
The part of the blue line is a clickable image map.
You can jump to the page where it is linking when you click it.
The dimness of the head lamp changes with consumption electric power. In my case it was just good brightness with the 2 ohm resistance.
Also, a big current flows to the resistor. It is about 4 amperes with 2 electric bulbs of 60W when it dim. Then the electric power of about 32W consumes with the resistor.
Therefore, the resistor needs to think sufficient the installation position of the resistor, because it becomes a high temperature.
I used the wirewound resistor of 50W as the resistor.