h
e it, including the H field line distribution
For what its worth I did a 50w battery charger for a handheld combat radio. It was similar to the charger cradle for an electric toothbrush except my charger was way more powerful I used 61 material ferrite bars 1" diameter and about 1"long. Maybe Amidon or CWS Bytemark. I ran it at about 80kHz wi th I believe a resonant push-pull converter. Worked very well.