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This one failed just slightly beyond the duration of its one-year warranty
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The secret, at least as far as I can tell, is slitting a nut to make a secure clamp for sawing, filing, and grinding.
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I needed more solder ribbon for resistance soldering, so I figured I should make a batch of the stuff.
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I should put it up on etsy.com for fifty bucks…
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They’re nominally 900 mAh, but the results are pretty much what you’d expect.
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A bunch of obsolete ICs; all I can say is they weren’t at the time.
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I put some salvaged hard-drive head motor magnets to good use
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Not being constrained by the confines of the original laptop case, I replaced it with a grossly oversized CR123A cylindrical lithium cell.
The Smell of Molten Projects in the Morning 