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  • galah commented on The Sam D's instructable Automatic Lights for Tool Chest2 months ago
    Automatic Lights for Tool Chest

    HiJust correcting your battery pack calculation. As the batteries are in series, you get more volt, but the same number of AH as a single battery.

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  • Demonstrating the CO2 Weight of a Gallon of Gasoline

    seems like there are a lot of apparently misinformed comments here, Why are there 26 pounds of stuff when you burn a gallon of petrol? Because thats what happens. The 'C' turns into CO2, the H turns into H2O. H20 isn't significant in the troposphere. Whats the point arguing its abundant somehere down low? CO2 concentrations were higher in the past? yes, millions of years ago. How is that relevant? Try taking look at real current temperature and rainfall data, and then see if you can support the pretence that nothing is going on. because thats

    seems like there are a lot of apparently misinformed comments here, Why are there 26 pounds of stuff when you burn a gallon of petrol? Because thats what happens. The 'C' turns into CO2, the H turns into H2O. H20 isn't significant in the troposphere. Whats the point arguing its abundant somehere down low? CO2 concentrations were higher in the past? yes, millions of years ago. How is that relevant? Try taking look at real current temperature and rainfall data, and then see if you can support the pretence that nothing is going on. because thats

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  • How to Run a Battery Electric Clock on Solar Power--Part II

    Circuit looks fine to me. You could maybe simplify it a tad with a zener diode across the solar cell and a series diode to the supercap, allowing everything to be built from the random diode grab bag, but that's not a significant improvement. Solar cells are supposed to be a light dependent constant current source so the resistors are optional. Very much doubt you would fry a supercap with your circuit.I'm wondering whether the supercap would have longer life than a NiMh battery however. Battery life is usually all about discharge cycles of full depth, and the cycle depth would be very small in this application (assuming you get sun at least once a week say). I had to replace the 'supercap' in my Seiko kinetic watch - it wore out. And NiMh batteries are readily available.

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