simple headlight reminders


Posted on Feb 6, 2014

These two headlight reminder circuits are easy to install and operate on the KISS (Keep It Simple Stupid) principle. The simple circuit involves adding just a 12V piezo buzzer between the lights circuit and a door switch. The buzzer sounds if the lights are left on and you open a door. The disadvantage of this simple circuit is that it`s annoying


simple headlight reminders
Click here to download the full size of the above Circuit.

to have the buzzer sound continuously if you want to leave the door open while the lights are on. The improved circuit overcomes that problem by adding a 1000 µF capacitor and a parallel 100kO resistor in series with the buzzer. Now, when a door is opened, the buzzer gives a brief burst of sound only, while the 1000 µF capacitor charges. The 100kO resistor discharges the capacitor when the lights are switched off.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Fast circuit breaker
    DC-to-DC AC inverter
    Coffee bits and bikes: Mini85
    TDA2822 Audio Amplifier
    how to make simple vu meter circuit at
    light up pumpkin
    FM Booster~Active FM Antenna Amplifier
    Negative Auxiliary Voltage
    Tesla HV Coil
    High resistance distribution circuit



    Top