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Folks,

Chuck mentioned scoring a bag of 2N3904s and I similarly discovered a mess o' 2N4401s. Suspecting that there may be caches of the popular NPNs (and their matching PNPs) around, here's a sample of a series of YouTube videos for those of us who want to monkey around and perhaps learn a bit.

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? Basic Bipolar Junction Transistor Analysis: The Common-Emitter Circuit
? https://youtu.be/unkBcz1-nLo?feature=shared

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? Basic Bipolar Junction Transistor Analysis: The Common-Collector Circuit?
? https://youtu.be/WZcCYgiGdd8?feature=shared

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? Basic Bipolar Junction Transistor Analysis: The Common-Base Circuit
? https://youtu.be/zBBuKWwjKq0?feature=shared

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The three above are selected from a playlist done for Bipolar Junction Transistors. The entire playlist are of this quality and are comprised of 15 videos.

And those 15 are part of an extensive series by Ralph Gable -- a retired electronics engineer -- who has put a lot of effort into a great number of videos he titles "Electronics for the Inquisitive Experimenter" including basic electronics to construction practices, and design theory. I first stumbled on Ralph's efforts when re-learning the ins and outs of my NanoVNA and then to tinkering with filters.?

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His method of teaching is thorough, precise, and aimed at the beginner (the ersatz Biz Admin graduate) and many come with accompanying documentation a la W2AEW's videos.?I highly recommend them as a great source of learning and study.