So far I'm just using the most BASIC models for RLC circuits, so they are just purely R-L-C. And for BJT's, I haven't learned very much atomic level semi-conductor phyisic's, yet (I will) so I'm not using models with junction capacitance yet.

I've been learning the 2ndODE's for basic RLC transient analysis. I suspect that that will get applied to mesh/nodal analysis by way of systems of ODE's, and so into vector spaces and matrices, of ODE's.

For back of the envolpe calulations of BJT's, in discrete/through-hole parts, when do the simple ideal models, drift from reality ? A hard driven BJT switch, for instance, I don't know how to calculate how they act in transistion. I guess I need the RLC model of a BJT

I've been learning the 2ndODE's for basic RLC transient analysis. I suspect that that will get applied to mesh/nodal analysis by way of systems of ODE's, and so into vector spaces and matrices, of ODE's.

For back of the envolpe calulations of BJT's, in discrete/through-hole parts, when do the simple ideal models, drift from reality ? A hard driven BJT switch, for instance, I don't know how to calculate how they act in transistion. I guess I need the RLC model of a BJT

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