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67CommentsNorfolk, VirginiaJoined November 1st, 2011
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  • $1 DIY Conductive Ink and Paint From Fire! (non Toxic, Homemade, Cheap)

    "Did anybody try to make conductive glue" Sodium silicate is made from dissolving glass or better yet silica gel into a hot an aquas mix of sodium hydroxide and mixing in water to get water glass. Then activate it with carbon dioxide to form an adhesive

    Certainly can be very easy. For instance a 1.5V battery with two thick wires and a thin copper wire is all that is needed to ignite paper it. The thick wires conduct current well enough to a thin wire that heats up from a large amount of current flowing though it. Its not a stretch to see 5 or 12 volts applied to two conductive ink terminals with a thin section in between generating heat, and we have not even gotten to the loony toons that would try to put 110v to it to see what happens. Im not saying conductive inks on paper should not be done, just that inconsistent ink conductance or design could lead to a fire.

    charcoal briquettes? Two words, The amount of "charcoal ash" means there is a lot more than just carbon. Some vendors even put in crushed powdered rock for fill. But if you don't mind all that then you would probably want to wash out the potassium hydroxide so that it does not eat your paper.

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  • shomas commented on krmartin3's instructable DC Boost Converter2 months ago
    DC Boost Converter

    I have to correct myself, I was assuming continuous output. Watts is a measure of power, not energy. If one needs to get more power then what is put int, it could be done by storing and releasing power quickly over a shorter time. One way this can be done with pulse width modulation the output into on and off duty cycles. spending different amounts of time in each. Over the course of an hour, a source voltage of 18v and a load that draws 8 amps will source 114 watts for each second of that hour. sourcing 114 watts * (3600 seconds, 60 seconds in a minute * 60 minutes in an hour) = 410,400 watt seconds( watt second is an expression of energy = joules). With an impossible 100% conversion, 410,4000 watt seconds of energy / 250 watts output means you can deliver 250 watts for just 164...see more »I have to correct myself, I was assuming continuous output. Watts is a measure of power, not energy. If one needs to get more power then what is put int, it could be done by storing and releasing power quickly over a shorter time. One way this can be done with pulse width modulation the output into on and off duty cycles. spending different amounts of time in each. Over the course of an hour, a source voltage of 18v and a load that draws 8 amps will source 114 watts for each second of that hour. sourcing 114 watts * (3600 seconds, 60 seconds in a minute * 60 minutes in an hour) = 410,400 watt seconds( watt second is an expression of energy = joules). With an impossible 100% conversion, 410,4000 watt seconds of energy / 250 watts output means you can deliver 250 watts for just 1641.6 seconds. That works out to about 27 minutes and 21.6 seconds. In a world with perfect efficiency using pulse width modulation, one could convert 114 watts to 250 watts with a 45.6% on duty cycle on his output, and a 54.4% off duty cycle.

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  • Build Your Own Flat Panel Solar Thermal Collector

    I would not use this for my house's hot water. But, it may work well as a pool water heater. Your right that these signs dont hold up long, but thats because of the sun's UV rays. Painting it will go a long way to protect it from those UV rays.

    Sins ultraviolet light breaks it down. But paint should do a good job of protecting it.

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  • shomas commented on jwmiller's instructable Aluminum Foil Plate Capacitor3 months ago
    Aluminum Foil Plate Capacitor

    Capacitance is proportionate to the area of the plates facing each other. for a given dielectric and spacing, if you double the area you double the capacitance. But two parallel plates do not make efficient use of the surface area of the plate. because it only uses 1 of two sides to each plate. If you role it into a spiral, plate A is facing plate B on both its top and bottom. Furthermore, when you role it, each sheet of aluminum only needs one cut. as the ends sticking out become your capacitor leads. That gives it a shorter path from lead to each part of the capacitor, and results in a lower ESR value, equivalent series resistance that is due to internal resistance in the capacitor. The spiral picture on the right represents two sheets of aluminum that need an insulator on both t...see more »Capacitance is proportionate to the area of the plates facing each other. for a given dielectric and spacing, if you double the area you double the capacitance. But two parallel plates do not make efficient use of the surface area of the plate. because it only uses 1 of two sides to each plate. If you role it into a spiral, plate A is facing plate B on both its top and bottom. Furthermore, when you role it, each sheet of aluminum only needs one cut. as the ends sticking out become your capacitor leads. That gives it a shorter path from lead to each part of the capacitor, and results in a lower ESR value, equivalent series resistance that is due to internal resistance in the capacitor. The spiral picture on the right represents two sheets of aluminum that need an insulator on both top and bottom as depicted in the picture on the left but rolled up.

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  • Wifi operates at 2.4ghz while in the US, while mobile frequencies are typically between 700 and 900 mhz. Lower frequencies penetrate buildings and foliage better, and because of the longer wavelengths, reflect off your chicken wire mess reflector.

    Wifi operates at 2.4ghz while in the US, while mobile frequencies are typically between 700 and 900 mhz. Lower frequencies penetrate buildings and foliage better, and because of the longer wavelengths, better reflect off your chicken wire mess reflector.

    Wifi operates at 2.4ghz while in the US, mobile frequencies are typically between 700 and 900 mhz. The lower frequencies penetrate building and foliage better.

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  • shomas commented on krmartin3's instructable DC Boost Converter1 year ago
    DC Boost Converter

    Even at 100% efficiency, no one can boost 12v@300 amps (3600 watts) to 18v@300 amps (5500 watts): Laws of physics, as in energy can neither be created or destroyed.

    capacitor inductor capacitor (pi filter) will clean up a lot of noise. The second capacitor needs very low ESR rating for best performance from the filter

    Your issue is two fold. One, by itself the voltage is too low. bump it up with more in series before you boost it. two, the power produced is extremely low and such that drawing even a modest amount of current drops the voltage to unusable levels. You need consider this last point when pairing it with a load, because your not going to pull 5 watts from a device that produces less than a watt.

    Can not get more energy out than is put in. Laws of physics and all. His units were given in volts and amp, but it were possible to build a booster to his specs, then for each second it runs it would create more energy than it consumes.

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