Transcription: The topic for this lesson is the bipolar junction transistor as an amplifier. In amplifier circuits, both DC and AC quantities are present. DC quantities carry an upper case roman non-italic subscript. AC quantities carry a lower italic subscript. For resistances, R subscript capital E is an external DC emitter resistance and R with a subscript of lowercase italic E is an external AC emitter resistance. Let's first discuss transistor amplification. From our previous lesson, we know that a transistor amplifies current since I sub C is equal to beta times I sub B. The base current in a transisto ...
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