Overspeed indicator


Posted on Feb 24, 2013

An op-amp comparator is used to compare the converter output with a dc threshold voltage. The circuit flashes the LED when the input frequency exceeds 100 Hz. Increases in frequency raise the average current out of terminal 3 so that frequencies above 100 Hz reduce the charge time of C2, increasing the LED flashing rate


Overspeed indicator
Click here to download the full size of the above Circuit.

IC = LM2907 or LM2917.




Leave Comment

characters left:

Fernando   Jan 11, 2019

Thanks for the diagram. What kind of change have to do it to have the led always on with any input frecuency higher than zero ?

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Dark Activated Switch circuit
    Touch on-off switch
    Sound-level-meter
    DC Motor Control System Block Diagram
    PWM Lamp or Motor Controller
    Multifunctional motor protection circuit
    200W Valve RF Transmitter circuit



    Top