The ‘drive circuit’ consists of an electromagnet — an inductor [Tanner] found in an old TV set — a reed switch, and a MOSFET. When the circuit is placed next to the fidget spinner ...
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Instead of using an air coil to generate heat in the cookware, this one uses an iron core instead ... power MOSFETs to power the device. A couple inductors limit the current to 20A, but it ...
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