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  1. SongDog

    Floating a cruise ship in a bucket of water

    It will if you do it right. Capacitance can be measured to exquisite sensitivity by counting individual electrons with a SQUID (vide Rod Harris-Lowe).
  2. SongDog

    SNR Vs bandwidth limitations

    Yes, SNR and usable bandwidth are interrelated. You want to read up on "signal detection theory".
  3. SongDog

    Most efficient way to rotate a cylinder using a motor?

    Just tilt the drum, like a cement mixer. Even 20-30 degrees tilt should do fine. Feed it from the raised end, not the side of the cylinder. Empty with a shovel from the same hole, or tip the whole thing back to dump it.
  4. SongDog

    Most efficient way to rotate a cylinder using a motor?

    Let's rather say one rotation per day. Haste makes waste. It's just a composter! Now we're looking at ~40 mW. This could easily be provided by one or two square inches of solar cell, perhaps scavenged from garden lighting. No need for a battery: if it only turns on sunny days, so what...
  5. SongDog

    Most efficient way to rotate a cylinder using a motor?

    Used bicycle parts are cheap or even free at a small-town dump. You don't need high speeds, one or two rotations per day is a lot for composting. Keep the rotation rate that low and you can get by on just milliwatts with lots of mechanical advantage. Then you can use a small solar panel to drive...
  6. SongDog

    Hot water (energy conversion)

    Interesting case. Too deep to siphon, too impure to use directly for domestic hot water. Since it has to be pumped out anyhow, there may be geothermal uses, but I suspect it's best applied to pre-heat a working fluid going to some other superheater (e.g. solar). I assume it's presently being...
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