In this video, I explain how to solve BJT circuits, and why we like to use the approximation of Vbe,on = 0.7V (or 0.5V, or 0.6V). I solve a simple BJT circuit assuming infinite current gain using the Vbe = const approximations and more exactly using the exponential dependence on voltage, and show that the error in making these guesses in typical situations is quite low.
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7 сен 2024