The amplitude of the swing will still be from 0V to +Vcc, less a bit.
The resistance the amp can drive is determined by its design. The load resistance needs to be enough to limit the current to the amp's max allowable current. Extra turns on the coil can increase the magnetic field.
You cannot get the coil current to be zero at rest and still produce a unidirectional coil current for both +Ve and -Ve going signals unless you run the coil via the capacitor and a bridge rectifier. Then, the coil current will be full wave rectified but will not produce a magnetic field accurately echoing the input signal.
Maybe some more info on what you are actually trying to accomplish would help.
Some indication of why the current needs to be unidirectional???
What is the end application of all this?
The resistance the amp can drive is determined by its design. The load resistance needs to be enough to limit the current to the amp's max allowable current. Extra turns on the coil can increase the magnetic field.
You cannot get the coil current to be zero at rest and still produce a unidirectional coil current for both +Ve and -Ve going signals unless you run the coil via the capacitor and a bridge rectifier. Then, the coil current will be full wave rectified but will not produce a magnetic field accurately echoing the input signal.
Maybe some more info on what you are actually trying to accomplish would help.
Some indication of why the current needs to be unidirectional???
What is the end application of all this?