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  • GordonS6 commented on Mjtrinihobby's instructable Quad Heat Pump Peltier Cooler! 1 week ago
    Quad Heat Pump Peltier Cooler!

    Indeed, stacking means to place one directly on top of another with thermal conductive grease between. I don't know how many could be successfully stacked, but I'm pretty sure that four would provide a much greater temperature differential. But the total number of calories transferred would remain about the same. Given sufficient time, the stacked modules should make the interior of the insulated box much colder! I think the limiting factor would be how much temperature the modules could withstand and still function properly. The top one in a stack would be pumping from the rather warm one beneath it. This method is used in some thermoelectric coolers for astronomy cameras to reduce temperature generated noise in the camera sensor.

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  • GordonS6 commented on Mjtrinihobby's instructable Quad Heat Pump Peltier Cooler! 1 week ago
    Quad Heat Pump Peltier Cooler!

    The temperature differential is very modest with your setup, but the energy savings is substantial! A Peltier module should be capable of up to 40 degrees F differential at full power. I suggest that stacking these four modules would produce close to that differential and use the same amount of power (15 watts), but would probably take a little longer to achieve maximum differential. Nice work!

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  • GordonS6 commented on MarcusW44's instructable Build a 3D Printed Curta Calculator4 weeks ago
    Build a 3D Printed Curta Calculator

    Very ambitious project! I remember when these Curta Calculators were advertised in magazines like Popular Science and Scientific American, 60 years ago! The were pricey even then, well out of my reach. I made do with a slide rule, pencil and paper! Now you can buy a decent electronic calculator for less than $5! But the appeal of these mechanical marvels persists! Nice work!!

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  • DIY 600 Watt Amplifier With Old Computer SMPS

    Most audio amplifiers are output rated "PIP", that is "peak instantaneous power". Same with speakers. The RMS (root mean square) continuous power output is likely less than 50 watts. An honest 50 watts should rattle your windows!

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  • Clear Snow the Laziest Way Imaginable

    Many years back (1960s), I lived in Northern Illinois where we got frequent and plentiful snowfall. I would shovel out my driveway very early in the morning, then the city snow plows would block my driveway again when they plowed the street....with a lot more snow than I had blocking the driveway to begin with. One morning I was running late and didn't want to take the time to reshovel the driveway....so I decided to melt the snow with gasoline. I poked holes in the snow, poured in the gasoline, stood back a little and struck a match! I got considerably more than I bargained for, as the gasoline literally exploded, blowing snow and flaming liquid everywhere! I was lucky none of the flames struck me! The small fires died out quickly and my driveway was again passable, but I never ...

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    Many years back (1960s), I lived in Northern Illinois where we got frequent and plentiful snowfall. I would shovel out my driveway very early in the morning, then the city snow plows would block my driveway again when they plowed the street....with a lot more snow than I had blocking the driveway to begin with. One morning I was running late and didn't want to take the time to reshovel the driveway....so I decided to melt the snow with gasoline. I poked holes in the snow, poured in the gasoline, stood back a little and struck a match! I got considerably more than I bargained for, as the gasoline literally exploded, blowing snow and flaming liquid everywhere! I was lucky none of the flames struck me! The small fires died out quickly and my driveway was again passable, but I never tried that again!

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