LED Volt Meter Circuit LM324

Posted on Feb 6, 2014

It`s a very useful circuit which when installed on your car gives the voltage of you car battery in a LED dot display form. The meter circuit is based on four comparators made of quad op amp LM324. The inverting inputs of IC are kept at at reference voltages 5. 6V, 5. 2V, 4. 8V, 4. 4V respectively at pins 2, 6, 9, 13 by resistors, R3, R4, R5, R6. The battery vol

LED Volt Meter Circuit LM324
Click here to download the full size of the above Circuit.

tage is directly fed to the non inverting input through the voltage divider arrangement using R1 and R7. When there is variation in the input supply the out put of each op amp goes high accordingly as they are wired as voltage comparators. The corresponding LED glows. To setup, connect the circuit to battery, adjust R6 so that required voltages are available at the inverting pins( refer description to get the required voltages).

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Theremin Circuit
    Bird Feeder Monitor Circuit
    power supply Transistor current limiter microcontroller controlled
    op amp Basic Frequency Control Circuit
    Digital Radar Speedometer Circuit
    transistor amplifier self bias
    The Measurements for MIT 3DL1 Run
    Programmers in circuit serial programming