Car Battery Saver Circuit

Posted on Feb 5, 2014

When the door is opened, SW1 closes, the circuit is powered and the lamp is on. C1 starts charging slowly through R1 and when a voltage of 2/3 the supply is reached at pins #2 and #6 of IC1, the internal comparator changes the state of the flip-flop, the voltage at pin #3 falls to zero and the lamp will switch-off. The lamp will remain in the off

Car Battery Saver Circuit
Click here to download the full size of the above Circuit.

state as the door is closed and will illuminate only when the door will be opened again. The final result is a three-terminal device in which two terminals are used to connect the circuit in series to the lamp and the existing door-switch. The third terminal is connected to the 12V positive supply. The circuit can be bypassed by the usually existing switch that allows the interior lamp to illuminate continuously, even when the door is closed: this connection is shown in dotted lines.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Magic Wand Conjuring Trick
    Soft Start For Switching Power Supply
    Coffee bits and bikes: Mini85
    Ambulance sirens circuit
    Descrete Multistage Light Sequencer
    quick jobs h bridge circuit to drive
    two stage fm transmitter bug more tank circuits
    pic based wwvb clock
    8-Channel DTMF Link: Encoder
    16 Stage Bi-Directional LED Sequencer circuit
    Serial LCD Library
    Voltage-controlled oscillator
    555 consisting of portable electronic timing hypnosis massage