Automatic Headlight Dimmer, Safe Yourself and Others

This schematic diagram shows an automatic headlight dimmer circuit for your car’s headlight, keep you safe in the dark with maximum bright for farthest visibility, but will automatically switch from high to low  beam when traffic approach to save others sight. With Q1 in moderate darkness the variable resistor must be adjusted to generate no base current through Q2. This system is triggered by headlights from other car. The high-beam lights on when there is no approaching headlights. The relay K2 is energized and K1 is not energized. Here is the schematic diagram of the circuit:

Automatic Headlight Dimmer circuit schematic diagram The car’s headlights will be switched to low beams when the phototransisor receives lights from other car coming from  the opposite direction, causing an increase in the collector and base current of the PNP. This substantial increase will energize the K1 relay. K2 is deenergized causing the high-beam headlights to turn off, so the low beam lamps will light.  For your convenience, the switch S1 should be located on the dashboard of your of vehicle. This switch must be turned off during the day, so that the circuit will always turn on the high beam lamp in sunlight. [Circuit’s schematic diagram source: seekic.com]

This entry was posted in Oscillators and tagged , . Bookmark the permalink.,
Possibly Related to "Automatic Headlight Dimmer, Safe Yourself and Others" Circuits

  • Car Headlights On Reminder
    More important than environmental issue of energy saving, avoiding car battery failure when you leave the headlamp turned on overnight in the garage is possibly more important for your concern. This is a circuit of automobile lights-on reminder if you … Continue reading →...
  • 555 IC Water Level Sensor/Detector Alarm
    This schematic diagram below shows a 555 IC water level sensor/detector alarm circuit. This circuit is powered through the emitter current of the BC109C. 555 timer is used as astable oscillator in this circuit. When this circuit is under dry … Continue reading →...
  • LM1830 Fluid/Liquid/Water Level Control
    This is Fluid/Liquid/Water Level Control circuit using LM830. The LM830 can be used to detect absence and presence of aqueous fluids. This application uses two probes and a voltage divider circuit to detect the presence of the fluid. Sometimes, there … Continue reading →...
  • Dimmer Switch, General Purpose Electric Power Control
    Dimmer Switch Introduction Dimmer switch can be used to replace your electrical switch for lamps, heaters, or some types of electric motor.  Dimmer switches will control the electricity not only for on-off operation, but they are capable of operating somewhere … Continue reading →...
  • VOX (Voice-Operated Switch)
    This schematic diagram below show a circuit of VOX Box (voice-operated switch). This circuit consist of a Schmitt trigger, a relay driver, and microphone preamplifier. The microphone preamplifier(U1) receive input signal which will be amplified. THRESHOLD control (R8) is fed … Continue reading →...

Comments are closed.