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All these arrangements are so obvious when they're laid out in front of you, but seem so difficult to envisage if you're trying to work them out from scratch. Either we're all switchlexic, or conjuring up this stuff is actually quite tricky.

A DPDT on-off-on switch is often used for a three position filter switch, with two alternative capacitors across the end pairs of terminals. The problem with this is that the layout of the options on the switch is illogical, with the minimum or maximum value on the middle position of the switch...