In this video, we demonstrate using a Mazilli or Royer oscillator driver with 100 nF capacitor resonant and using IRFP260N and MOSFETS to drive far ferrite core at a resonant frequency of 218 kHz. At this high frequency we can heat small metal objects very quickly. This will allow braising of small metal parts. This is especially useful in jewelry and in annealing brass cartridges from spent ammunition. Typically, approximately 60V DC from a SMPS will work great, but also AC from a variac can be used. The video here demonstrates the heating effect of the high permeability ferrite toroid with a small gap cut in the ferrite to reduce ferrite heating and cracking.