I have an idea of creating a train horn like device with a variable pitch. I need a variable force that acts on the membrane of the horn. I have the idea of the construction ready. In short, a ring pushes the membrane with a variable force. My question is, can a solenoid be used here? I'd drive the solenoid with a power transistor and PWM. The function of the solenoid would not be to move the whole throw. It would move only a fraction, while the membrane would act as a counter force.
I'd drive the solenoid with a power transistor and PWM.
The step motor might work. Though it has its steps. The faster action I want, the more direct it has to be and the more steps I'd hear in the produced pitches. The smoother I'd want the produced pitch changes to be, the more gears I'd need between the motor axis and the contact to the membrane and the slower the pitch change would be.