I am working on understanding BJT transistors through trying to get LTspice IV to produce results that I expect. Of the many pages I've read about transistors, I am currently working off of this one: http://www.learnabout-electronics.org/bipolar_junction_transistors_04.php.
I am trying to (1) identify the range of voltages (by looking at the graph) that are this transistor's active region.
But, where does the ground go? I placed it in the only place it seems to make sense, but it means that I am not able to measure the place it seems to me that the results will appear, presumably because it is just going to be 0V.
After I get that resolved, I want to create a graph that has a sine wave p-p entirely in the active region for the input, and see the same sine wave except with its amplitude enlarged by a DC voltage. This is what I think a pre-amplifier does. I have not yet digested the idea that the transistor is current controlled instead of voltage controlled, which I was hoping to deal with by adding a resistor--after getting something working.
My LTspice IV file is attached along with a snapshot of it. What am I misunderstanding?
I am trying to (1) identify the range of voltages (by looking at the graph) that are this transistor's active region.
But, where does the ground go? I placed it in the only place it seems to make sense, but it means that I am not able to measure the place it seems to me that the results will appear, presumably because it is just going to be 0V.
After I get that resolved, I want to create a graph that has a sine wave p-p entirely in the active region for the input, and see the same sine wave except with its amplitude enlarged by a DC voltage. This is what I think a pre-amplifier does. I have not yet digested the idea that the transistor is current controlled instead of voltage controlled, which I was hoping to deal with by adding a resistor--after getting something working.
My LTspice IV file is attached along with a snapshot of it. What am I misunderstanding?
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