Quote:
Originally Posted by Sideband
If the voltage to the motor appears to be hunting it doesn't necessarily mean that the the control board is faulty. It MIGHT be trying to control a faulty motor by varying the voltage to it....if the motor is faulty for instance, the feedback voltage from it to the comparator will vary so the transistors will try to compensate. Then again if either of the transistors are faulty but the motor is good, you'll possibly get a similar effect.
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I'm confused! There is no feedback from the motor, Its a standard DC motor, unless of course the circuit is measuring the current through the motor and using that to compensate for speed variations.
Perhaps you could enlighten me.
You could i suppose fit a resistor of around 47 ohms across and instead of the motor and see it the voltage across it fluctuates. If it does the regulator is faulty, if not then it could be the motor.