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The nominal power for F12N field coil is 25 W.

The simplest supply for this power is a 5-10 A silicon bridge followed by 2,000 uF 200 V electrolytic capacitor. This is plugged directly into 120 V wall outlet. You may include 10-100 Ohm 20 W resistor between the bridge and the capacitor to fine tune the output voltage.

At 25 W, field coil and yoke will be barely warm to touch.

F12N is much better though at 40 W on the field coil.

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