I see this circuit has many applications for creating high voltage from a battery source in a very simple and compact manner. However, I’m not sure of the exact basis of oscillation - is it:
1. Current flows through FB, turns on transistor.
2. Primary induces opposing voltage in FB due to opposite winding directions.
3. Since FB is off, transistor is off and cycle starts again.
Or is the mechanism to do with saturation of the primary?
Also, is the resultant waveform HFAC, or pulsed DC?