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2

There are two types of transformer 1) High (ideally infinite) permeability, used as power transformers 2) Low permeability, used as flyback transformers, where \$I_{sat}\$ is a key specification The difference is that a power transformer is not intended to store energy in the core, that's minimised in the design. While it does have a net current that will ...


1

R2 doesn't really do anything with thermal runaway. The voltage divider network of R1 and R2 make the voltage bias for the base to emitter junction. When Re is added to the transistor circuit, it controls the base to emitter current to DC ground. Without this, the only current limiting it has is its intrinsic resistance of the junction that defines BetaDC. ...


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