maximum minimum voltage indicator


Posted on Feb 4, 2014

This circuit indicates which of three voltages in the range from about about -4V to about +4V - at A, B and C - is the highest by lighting one of three indicator LEDs. Alternatively, it can be wired to indicate the lowest of three voltages or to indicate both the highest and lowest voltages. Op amps IC1a, IC1b & IC1c are wired as comparators, whil


maximum minimum voltage indicator
Click here to download the full size of the above Circuit.

e the three indicator LEDs and their series 1kO current limiting resistors are strung across the op amp outputs to implement the appropriate logic functions. For example, LED A will light only when pin 8 of IC1c is low (ie, A greater B) and pin 7 of IC1b is high (ie, A greater C). Similarly, LED B will light only when pin 8 of IC1c is high (ie, B greater A) and pin 1 of IC1a is low (ie, B greater C). LED C works in similar fashion if the voltage at C is the highest. Note that if all the LEDs and their parallel 1N4148 diodes are reversed, the circuit will indicate the lowest of the three input voltages. And if each 1N4148 diode is replaced by a LED, the circuit will indicate both the highest and lowest inputs.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    SW Loop Antenna
    DTMF decoder with voice!
    PC parallel port Null Printer Adapter
    Nicad Battery Tester
    circuit ultrasonic mosquito
    Proximity Sensor Circuit
    Power Supply
    lcd interfacing with cy8c3866 psoc 3
    555-channel temperature test circuits



    Top