reversing polarity

Discussion in 'General Electronics Chat' started by rheat, Jan 9, 2008.

  1. rheat

    Thread Starter New Member

    Jan 9, 2008
    1
    0
    Does anyone know how I can revers the polarity to a DC servo motor so that when the input voltage is increasing the motor turns one way and when the input voltage is decreasing the motor turns the otherway?
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You need a dual H-bridge circuit.

    Look at such components as the L293 for low power and L298 for moderate power.
     
  3. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    Sorry, but your question is very confusing and ambiguous. You need to elaborate on what you want to do more, so that we are able to help.

    Steve
     
  4. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    last one of these I built was for a model train enthusiast to make his train go backwards and forwards with one control knob (pot). Stop was in the middle.

    All I did was take take a 12 volt train and supply it from the centre of a complementary emitter follower pair, themselves supplied from 24 volts DC.

    If this is what you are after I'll try to remember the circuit.
     
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