In many ways, the oscilloscope is the ultimate piece of test gear, and I'm itching to build a good one. I'm not at that level yet, though, so some simpler projects will be better to accomplish first.
Most of the time, it seems to me, when I'm investigating a circuit to see what's going on, I'm happy to either get a reasonably accurate voltage reading (if the value varies slowly) and a view of the waveform if it is time-varying.
So the idea here is to make a simple one-channel signal viewer that can do both of those things.
Although I hope it will be useful, the primary motivation is to learn and gain experience with circuits of this type. And, also, I am interested to make it very small and battery-powered -- making it as usable as a typical multimeter.
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