Hi, just for deeper understanding I'm trying to figure out what the equivalent schematic of the given hybrid-pi model of a common base bjt looks like. Just looking at the emitter and collector currents it seems as the third picture would be correct. The emitter current goes towards the base in both and comes out of the base to the collector in both. The only difference that is confusing me is that V_CB is labelled plus minus but in the third picture the battery polarity is the opposite. My opinion is that the hybrid-pi model shown is for a pnp transistor. Am I correct? What if I_C had pointed in the opposite direction in the hybrid-pi model would that make it a npn or pnp transistor? Any tips for converting from one to the other?
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