AC electromagnet questions--I'm smart, but not an engineer--Help! I need an AC electromagnet with these requirements: -17 Hz -square wave -40-60% duty cycle -will run on 60 Hz 110 volt current, and can be plugged into a wall outlet (this one is not an absolute necessity, but it would help a lot) -strong enough to pick up a couple hundred pounds (I won't use it for lifting, and that strength is just a general guess, I can start with a weaker magnet if I want to, and work up to higher strength) Help? Who can build this, or can direct me to the right texts to build it myself? Any helpful suggestions are appreciated. I'd be happy to pay one of you to build it, or to tutor me on how to build it. I can definitely pay. :) Well?