If winding the primary of isolation transformer, which value should be used-- ohms as from volts divided by current, or impedance of AC source as terminals resistance, with the high frequency KHZ that runs the primary?? The online calculator asks for reactance in ohms of inductor to get the inductance value. Then the number of turns is calculated for primary by the on line calculator for toroid core that uses the inductance. Impedence is the square, of ratio of volts, since the number of turns is not known to begin with.
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