Member Since: January 6, 2010

Country: United States

  • That's true only if it has closed loop control of the velocity, using an encoder or similar for feedback. I don't see any indication one way or the other but my guess is that it does not have that.

  • The reason you shouldn't sand a soldering iron tip is that they are made of copper (for good heat transmission) but with a thin iron plating. The iron plating is there to protect the copper from molten solder, because over time hot solder can actually dissolve copper leaving the tip rough and pitted. But iron is immune to this, so as long as the plating remains intact, your tip should stay smooth and shiny.
    If you used very fine sandpaper or steel wool and the tip is still silvery, it's probably OK. If you sanded away the iron plating and you can see the copper underneath, the tip is still safe to use and should still work reasonably well, but it will wear out faster than if it hadn't been sanded.
    The best way to clean a soldering iron tip is to coat it with with solder and then wipe it on a dampened sponge when it's hot. Ideally a cellulose sponge since plastic ones can melt. If that's not enough, try a soldering iron cleaner made of brass shavings (like Sparkfun TOL-08964) or in a pinch, a copper (not steel!) Chore-Boy scouring pad. These also work best when the iron is hot.

  • The 12MHz oscillator frequency is internally multiplied by 4 (I think... check the startup.S file for the PLL configuration) meaning the CPU core runs at 48MHz.

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