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I do plan to switch out the 555 timer at some point, and I have zero experience with micro-controllers. But, your success so far with the motor controller gives me hope! Were you able to learn just from the application notes? What materials would you recommend to help learn?
I'll have to try the small caps on the driver input - you're referring to the signal input, right?
As for the diode, it appears that the spike takes about 100 ns to build, but I couldn't find the forward-recovery time (is that right?) in the data sheet and I have no idea whether a typical diode can handle that. I haven't tried removing one of the two inductors, but that could at least verify the source of the spike.
Lotsa stuff to try! Will have to save it for another day...
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