Hello. I want to learn the physics behind transistor voltage regulators. But I can't understand something. Let's say we have a constant base voltage VB, an emitter voltage VE, base emitter voltage VBE. The three are united by the formula VB=VBE +VE. I can't understand why if VE rises while VB is constant, VBE(the transistor turn on voltage) will be reduced. I know that you can increase it by reverse biasing the base emitter junction, but I dodn't know the oposite Is also true. I also can't understand why if VBE reduces, the conduction of the transistor also reduces and the collector-emitter ressistance increases. It would be great if someone help me understand the physics of this.