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sorry i bluffed my way through the electronics sections of the exams. i'd have to go look it up and repost what i founded.*

quick question otherwise-this tumbling, is vibratory media an option-you...

Yes, transformer, rectifier, and then controller and diode...i forget exactly. My mentor has passed on and i didn't ever build one on my own. We used a chip of some sort for regulation-only using a...

a low amp, variable voltage power supply (ac/dc convertor) made for operating 12v devices like ham radios might work.

or consult your local "old time" ham who can usually build or point you to a...