Variac is not a good idea, they are auto-transformers and as such are not isolated from the main supply. It is possible to have a potential of 120v from the DC power supply to ground.
Although ideal, you do not need a toroidal, a square laminated TXr will do, toroidals are just more effecient.
Al
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |