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The transistor enters a saturated state, or drives an electronic switch. Therefore, the calculation parameters are important.
After the load current is saturated, the base current must be Ib=Ic/Beta. Transistors have different gains, so we want to use the lowest value of the test version to ensure saturation.
Rb= (VP-VBE)/Ib= (VP-VBE)* amplification factor /Ic= (VP-VBE)* amplification factor *Rc/VP