Lights On!


Posted on Feb 5, 2014

This circuit ensures that you will never again forget to switch on the lights of your car. As soon as the engine is running, the dipped beams and the sidelights are automatically switched on. The circuit also causes the dipped beams to be extinguished as soon as the main beams are switched on. As you can see from the schematic diagram, no special


Lights On!
Click here to download the full size of the above Circuit.

components are needed. When the engine is running, the alternator will generate a voltage of more than 14 V. Diode D1 reduces this voltage by 5. 6 V and passes it to the base of T1 via R1. Due to the resulting current, T1 conducts. The amplied current‚ows via R3, the base of T3 and D3 to ground. This causes T3 to also conduct and energize relay Re1. If the driver now switches on the main beams, a current‚ows through D2 and R2 into the base of T2, causing this transistor to conduct. As a result, the voltage on the base of T3 drops, causing T3 to cut off and the relay to drop out. When the main beams are switched off, the previous situation is restored, and the relay again engages. The dipped beams and the sidelights are switched by the contacts of relay Re1. Diodes D5 and D6 ensure that the sidelights are illuminated if either the dimmed beams or the main beams are switched on. In practice, this means that the sidelights will be on whenever the engine is running, regardless of whether the main beams are switched on.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Scope Probe
    tda7262 stereo 20 watts audio amplifier circuit design
    Negative Charge Pump with Ring Oscillator
    how to make simple earthquake sensor
    simple microphone preamplifier
    arduino yogurt maker
    LM317T Variable Voltage Regulator
    Model Theatre Lighting Dimmer
    Triac dimming circuit diagram



    Top