| 摘要 |
The device comprises a light dependent resistor (LDR) connected into a transistorised amplifier circuit which drives a relay coil. The relay contacts are connected into the headlamp circuit so that when the light from the headlamps of an oncoming vehicle is detected the relay operates to switch the headlamps to low beam, and when the light passes to restore the headlamps to high beam operation. The circuit is powered from the vehicle electrical system.
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