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So, I've learned the common emitter circuits. And an emitter repeater.
Common base a little.
DC, everything. It was useful, informative and interesting. For OE, I figured out how to determine when there will be saturation. Let's get it down, it'll grow and all.
Now absolutely all books force the student to climb into the wilds of stabilizing the working point for a reason, but for a variable input signal. I don't need that, I don't need a flashlight. Goodness, incoming and weekend resistance - leave it for your radio, I don't need it.
Now I need to understand how this DC circuit is calculated. What's the cause, what's the effect? It's an important part of the flashlight.
The transistor is saturated. I took the resistance at random, and I don't know anything about this scheme yet. The way out here is the collector.