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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.
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This kind of picture requires a bit of tweakage, because the default camera settings deliver an essentially gray picture with no contrast.
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Heck, it even has a customized header image!
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The cheap solution seems to be running the engine at about 1/3 choke
