Core Turns
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Turns per volt and wire area

Example turns and wire area only

Window, secondary ohms, and C are skipped when they are not positive.

Worked example

PSAc

Primary Secondary

Regulation used 5%

Turns per volt 4.6922 /V

TPV = 1 / (4.44 * f * Bmax * Ac * 10^-4)

Primary

Primary turns 1079.2042

Np = Vp * TPV

Primary wire area 0.1667 mm2

Area mm2 = current / J

Secondary

Secondary turns 59.1216

Ns = Vs * TPV * (1 + regulation)

Secondary wire area 2.6667 mm2

Area mm2 = current / J

This is not approval to build a mains power supply. Insulation, temperature rise, and safety are not checked.

1.15 is the CRGO silicon-steel constant only if you enter it. The 2.5 to 3.5 A/mm2 range is a note, not a stored row.