October 12, 2010
The circuit I am using is attached. I know the circuit works because it will move the motor forward and reverse on 9V.
When I apply 9V DC to it, things work as they should. I can use my transmitter to forward and reverse the motor.
When I apply 12V DC from a lawn and garden tractor battery, the TIP 127s begin to smoke. I have already burned one out.
After replacing the burned TIP 127 again it works on 9V but again apply 12V DC and more smoke.
Any suggestions what might be the problem? I really need to control this 12V motor (the motor is a DC brush type, drawing approx 120mA without a load)