Voltage comparator circuit


Posted on Jun 22, 2012

An op amp is used as a comparator and a sink for LED current. The output voltage of the amplifier changes about 1.4 V depending on the direction of the current. Only one transistor is on at any time. Maximum LED current is limited to 25 mA by overcurrent protection of the uA741.


Voltage comparator circuit
Click here to download the full size of the above Circuit.

If LEDs are not capable of carrying such a current or an alternative op amp is used and an additional resistor R^ is necessary.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Power Supply for the 8051 Microcontroller
    Auto-advance projector
    Light-sensitive-audio-oscillator
    Auto Alarm
    Space Age Sound Machine Circuit
    Protectors Circuit on SMPS (power supply) Schematic Diagram
    Electronic Torricelli Barometer Circuit
    hi fi stereo multiplexer for fm
    Blinken lights circuit
    ultrasonic cleaning transducers series parallel
    Servoelectric Guitar Project
    INA326 327 a single power PID Proportional - Integral - Derivative temperature control loop circuit



    Top