TL494 for DC MOTOR

Discussion in 'General Electronics Chat' started by fourty, Jan 24, 2014.

  1. fourty

    Thread Starter New Member

    Oct 13, 2013
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    0
    hi! i want to drive a Dc Motor with TL494 and i can t found how to fix duty cycle can someone help me??
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,510
    2,369
    By fix, do your mean 'set' or vary?
    Max.
     
  3. fourty

    Thread Starter New Member

    Oct 13, 2013
    13
    0
    i mean to vary
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    1,103
    Duty cycle varies according to the voltage on pin 3.
     
  5. fourty

    Thread Starter New Member

    Oct 13, 2013
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    0
    thanks..but how to choose the right value of the resistance to vary the duty cycle in pin 3 ???
     
  6. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,777
    1,103
    I'd suggest:
    Connect one end of a potentiometer (say, 25k or 50k...the value isn't critical) to ground, connect the other end of the pot to Vcc (positive supply) via a resistor whose value is ~10% of the pot value, and connect the pot wiper to pin 3.
     
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