[Menu]>[Application]>[Circuit Idea for the Car]
Head lamp illumination
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.
Even if it does not turn on the head lamp at night in the city, you can drive a car.
However, the head lamp does not only confirm the front of your car. It has even the role that informs the existence of your car to the car that come toward or pedestrian.
Therefore, there is the possibility that becomes an accident when the head lamp is getting broken.
Even with, when you drive a car at the bright way in the town, sometime you don't understand that the head lamp is broken.
Circuit where I introduce here it checks the normal operation of the head lamp and warns to the driver in the case that the electric bulb is not lighted.
In the circuit the method that the normal operation of the head lamp is confirmed with the presence of the light of the head lamp instead of current flow is being taken.
The light of the head lamp detects by using a Cds element( the resistance value changes by strength of light ). Each Cds attaches to the head lamp of the right and left. The LED( Light Emitting Diode ) is attached in the driver's seat for the confirmation of the normal operation of the head lamp.
In the case that it is able to detect light, the LED of the driver's seat becomes illumination condition and it understands that the head lamp is lighted normally.
In the case that it is not able to detect light, the LED flickers by the multivibrator circuit and it understands that the head lamp is cut.
LED flickers in the case that which whether of the lamp of the right and left cut.
Confirmation of the lamp(right or left) that cut is carried out after you stop the car.
Multivibrator circuit is able to make even if IC is used. Even with, the transistor circuit is being used to make the device compactly this time.
Although it is natural this circuit operates only in the case that the head lamp is lighted up.
With the figure of the top the 'Head lamp illumination confirmation device' part(red part) is a clickable image map.
You can jump to the page of the production when you click it.