reversing polarity

Thread Starter

rheat

Joined Jan 9, 2008
1
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?
 

studiot

Joined Nov 9, 2007
4,998
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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