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I'm still trying to work out why you need a voltage sensing switch in this position, it may just be necessary between the battery and the USB socket ? 4007 diodes have a very high reverse resistance and the capacitor will use very little power once It's charged up Or have I missed something !
This may not be quite true !, by sanding soft wire you are effectively giving it a greater surface area, imagine a cog wheel if you had no teeth on it, it would just be the surface area of the diameter, now cut the teeth and check the exact external surface area ?
I can't completely vouch for this (having a great shortage of teeth myself) but I have on good authority that the standard version of Listerine has a chemical in it that melts the glue that holds caps onto teeth, probably why it's recommended by many dentists ?
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