DC motor speed controller with 555 timer


Posted on Feb 7, 2014

Speed regulation is accomplished by sensing the motor current with R17 and using it as positive feedback to compensate for motor resistance loss. The gain pot should be set to a point just below the point where the motor speed oscillates. After finding this point, you may want to change the value of R11 to get better speed control range. Q3 limits


DC motor speed controller with 555 timer
Click here to download the full size of the above Circuit.

motor current. D4 and C8 capture some of L1`s inductive kick to produce a loosely regulated -12 volts for U3. SCR1 acts like the usual flyback diode once C8 has stored the needed energy, preventing significant power losses.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Lamp Dimmer / Motor Speed Control
    Ham Band Vfo Circuit
    High And Low Voltage Cut Off With Time Delay
    Linear Video Amplifier SECAM PAL and NTSC
    capacitor values for non inverting op amp circuit
    How the capacitor works (in a debouncing circuit)
    one tube regen radio circuit
    Tilt Sensor via Accelerometer Circuit
    Notch Filter



    Top