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The motor brushes seem to be a pair of stiff wires
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I glued a surface-mount MOSFET relay to the back of the PCB with urethane adhesive
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What’s truly odd is that the concrete (or whatever) filling is also warped.
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With the lens in the spindle, I can spin it at a few hundred RPM and persistence of vision blurs the beam into a nice, symmetrical disk.
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The power company hates gadgets like this…
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Some folks contend the knob unbalances the handwheel, but I’m not convinced that’s a real problem.
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Listen for her on 150.888 MHz… she’s running QRP with a bad antenna.
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You’d like to display those values on the final plot for later reference…
The Smell of Molten Projects in the Morning 