Common emitter circuit, when the V1 power supply (5V) is not enough to provide the transistor collector, Ic
"When V1 is 5V, how do you calculate the current at the b pole?" Of course you can calculate...
As shown in the figure above, after the TVS tube SMAJ58A has degraded in performance and turned into a low-resistance state (it may also break down and short-circuit), the current of the 48V power sup...
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