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The black bar marks the negative terminal and the corner-cut side of the base marks the positive terminal.
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There are many wrong ways to do this, all of which produce terrible results, pose a serious risk of personal injury, or both.
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Now, it’s not a great picture, but it’s one of the few we have from that era.
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I use the Standard edition of Cadsoft’s EAGLE schematic capture and PCB layout program, which … meshes nicely with the capabilities of my Sherline CNC mill
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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…
