Twilight Dirac
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Electromagnetism sounds like a fun interest. I am trying my best to understand alternating current, transformers, relays (that is pretty much direct current switches), and more. As part of my old telephone collection and interests in how they work.
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Old telephone electronics are definitely a good way to get started. Everything should be low frequency enough to work with. You probably want to pick up a 20 MHz oscilloscope if you don't already have one. You can often get those for around $20 used and the should be fast enough for the sort of stuff you are doing.
I just started reading Collective Electrodynamics by Carver Mead, which is a really interesting theoretical approach to electromagnetism if you are interested in that end. Haven't had that much time to read it yet because I am busy with other responsibilities though.
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