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water-powered clocks and calculators

Discussion in 'Electronic Basics' started by [email protected], Jan 23, 2006.

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  1. Guest

    Re those clocks and calculators powered by a water battery, e.g.:

    Can someone tell me how to make such a battery? One that would fit into
    a relatively small space such as the commercial products do? Or is it
    possible to purchase just the battery somewhere?
  2. Rich Grise

    Rich Grise Guest

    The only way to purchase this "battery" is to buy their bill of goods.

    It operates on phlogiston. It's got a moisture sensor, a CMOS comparator,
    and a watch battery.

  3. Guest

    A watch battery?! Sounds like false avertising.
  4. Bob Masta

    Bob Masta Guest

    There actually is a water-powered "battery" I read about maybe a
    year ago. Water is forced under pressure (maybe gravity alone?)
    through a slightly porous ceramic element, producing a voltage
    difference across the ceramic. I don't recall OTOH what physical
    principle was involved. I think this is a really low current device,
    but might be fine for CMOS clocks.

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    Home of DaqGen, the FREEWARE signal generator
  5. Bill Bowden

    Bill Bowden Guest

    You can make a battery using salt water and copper and aluminum,
    but you need 5 cells in series for 1.5 volts to power a clock.

    Here's an example:

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