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This one failed just slightly beyond the duration of its one-year warranty
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Once a year you gotta clean the crud out, whether it needs it or not.
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I cut two transparent disks from ordinary electronics packaging material, plus a red disk from the Primary Red filter material mentioned there…
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Dragonflies date back to the Age of Dinosaurs
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When I checked the package, most of the dead-on-delivery cells had swollen bottoms
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Bottom line: using the ATmega168 hardware SPI provided a factor-of-15 speedup and serial digital input, too.
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Usually I replace the blade on my ancient (cast iron!) 14-inch Delta band saw when I can no longer force it through the thing-to-be-cut
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Think about it: an iron casting, with machined-flat surfaces, stamped with instructions.
The Smell of Molten Projects in the Morning 