I wired up the Next Big Thing in metal detecting this week -- or rather, half of it -- enough to assess whether my design would work. I powered it up and took a look inside, with a digital oscilloscope. The oscilloscope registered RMS, average AC, peak-to-peak ... but my circuit outstripped the performance of the trace (the graph of voltage against time). Does my Next Big Thing work? I have rudimentary evidence that it does, but I didn't expect this. Rather than seeing that it a) works, or b) doesn't, c) my measuring instrument is under-powered.
POSTSCRIPT: I built the other half of the circuit, and joined the two halves. It picks up a South African R5 coin (80% the diameter of an old English penny) at 185 mm. This is very good, and it is a first test. However, the design is so extremely iffy, it will not work in the field as it is.
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