![]() The values of the resistor on the left of the circuit (200k and 100k) are for reducing input current to microAmpere levels. Search for “npn” in the component library and place/rotate as seen in the diagram. Make sure to rotate the component so that the arrow is facing up, as that is the current direction we want. Search for “cur” in the component library and place the device where it is located in the circuit. ![]() There are two parts that I have not used in the context of these posts: the current source I1, and transistor Q1. In order to get the same looking graph (very good info to have for specific transistors, models change based on what parameters they have in LTSpice), I’d suggest using a testing circuit like this: The values above are important to circuit designs with transistors involved. Beta values are typically listed in the datasheet of bipolar transistors.
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