Hello,
I wanted to control a DC motor speed (but not direction) , so I made a circuit of only one switching transistor to be able to transform the low power PWM signal into a high power one to feed it to the motor .
now , if I want to control the direction with that same circuit , why wouldn't I take the output of the ct. (connected to motor ) and use some kind of relay to be able to reverse the polarity of the motor terminals back and forth by a signal from the microcontroller and be able to control the motor direction with one switching transistor .
why is that not correct , and if it is possible , why do we need 4 switching transistors in the H-bridge configuration to be able to control the motor speed and direction .
I wanted to control a DC motor speed (but not direction) , so I made a circuit of only one switching transistor to be able to transform the low power PWM signal into a high power one to feed it to the motor .
now , if I want to control the direction with that same circuit , why wouldn't I take the output of the ct. (connected to motor ) and use some kind of relay to be able to reverse the polarity of the motor terminals back and forth by a signal from the microcontroller and be able to control the motor direction with one switching transistor .
why is that not correct , and if it is possible , why do we need 4 switching transistors in the H-bridge configuration to be able to control the motor speed and direction .