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you can wire a second MOT in series with the first, fully short the secondary on the second MOT, and you should run a lot cooler on any setup you use. I get 45 minutes using mine without risk of meltdown/smoke. Not sure EXACTLY why it works, found it while reading about transformers in material from the early 1900's. I think it is a sort of inductive resistor, which allows for the absorption of extra power on the circuit when your primary is not running, so you have a resistor that reacts to your use of power. That is at least how i think it works, the writer had a few theories of his own.
How Electronic Switches Work For Noobs: Relays and Transistors
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