I have a controller for an air conditioning unit but the speed of the fan was very slow. The motor controller was being controlled by a triac which is triggered from a microcontroller through a transistor and an optocoupler. The frequency changed as the speed change but it is not enough to drive the motor to a certain speed. I need to be able to add about 30% of the frequency output to be sent to the triac to increase the voltage. Is there anybody that can help me out of this? I'll appreciate it very much any help you can contribute on this matter. Thank you very much guys.