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Yeah, OK, it’s a Slide Rule Gloat…
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Somewhat to my surprise, the dimension specs for alkaline and rechargeable cells aren’t quite the same.
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It was pretty exciting to have a small sun in the palm of my hand until the contact finger fell to the bottom of the compartment.
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The schematic shows what real engineers could do, back in the days when transistors came individually packaged with a ten-dollar price tag.
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They don’t care. They don’t have to. They’re the phone company.
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As you might expect, the switch contacts were badly intermittent.
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It’s much too low when you must filter it down to DC.
