/diy/ - Do It Yourself

>>2602585
I'd be able to post parts of my professor-assembled uni textbook on the section, though first I'd catch yourself up on solving algebraic equations with complex numbers. I don't think calculus is necessary for this part, though basic calculus is behind why capacitive and inductive impedances have their values.

>>2602627
Firstly, use NPN transistors in common-emitter configuration. Secondly, flyback diodes are to be placed across the relay coil. Thirdly, you can get away with two SPDT relays instead of four SPST relays in order to reverse a motor and turn it off. With your and my circuit though you can't have it freewheel, only magnetically brake, in which case you'd need a third relay, or ditch the ability to magnetically brake by using a single DPDT relay for reversing and a series relay for turning the whole thing on or off. See "switching motor direction with DPDT relay" on google images.

Also you'll likely want an arc suppression capacitor if not a TVS diode across your motor.