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Yes. Theres a little math and science involved that i dont have memorized, but the bare minimum would be a cheap ebay DMM chip (an LCD that reads voltage) tied in parallel with the output of a potentiometer. I would use the -12 as your low potential and +12 as your high, giving you adjustability up to 24v. Hope that helps!
Yes. If you only need that voltage, i would use a potentiometer and hook the load (your saw) up to the output. Adjust the potentiometer until you are delivering 18v under load. Then measure the pot and replace it with resistors totaling the same (within 5%) resistance level. The current demands might be higher with that device, so don't be surprised if you smoke the supply.
Good to hear that you got it sorted out.
Very cool. I took a different approach with mine, but i like your use of the wheel and tire as the base. Thats a great way to prevent damage to the floor.
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I love it! It's simple, cute, and functional. I was going to make recessed shelving for my bathroom, but i may just build a variation of your design instead. Great work!
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