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  • Eco Friendly Metal Detector - Arduino

    I love the design. I just have two questions about it.1) The description talks about eddy currents reducing the length of the time the field is sustained. The other possible cause would be the nature of the metal changing the inductance. If this was the case, I'd expect a ferromagnetic object to delay the fields collapse, and a non-ferromagnetic object (like copper or aluminum) to speed up the collapse. If it was eddy currents, you'd expect the both types of metals to have the same effect.2) the signal diodes across the transistors hooked up to the transmitting coils look curiously placed. My understanding of inductors is that when the field collapses, the energy reclaimed from the field drives electrons in the same direction as they were already going. In which case, I would have thoug...

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    I love the design. I just have two questions about it.1) The description talks about eddy currents reducing the length of the time the field is sustained. The other possible cause would be the nature of the metal changing the inductance. If this was the case, I'd expect a ferromagnetic object to delay the fields collapse, and a non-ferromagnetic object (like copper or aluminum) to speed up the collapse. If it was eddy currents, you'd expect the both types of metals to have the same effect.2) the signal diodes across the transistors hooked up to the transmitting coils look curiously placed. My understanding of inductors is that when the field collapses, the energy reclaimed from the field drives electrons in the same direction as they were already going. In which case, I would have thought the diodes should be across the transmitting coils, not the transistors. I would be interested to know if any current flows through the diodes in their current placement.

    a magnetic field can induce currents in any conductor.if that wasn't the case, generators with copper windings wouldn't produce power, nor would transformers work.

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  • Up-cycle News Paper to Plant Pot to Grow Tomato

    For small seedlings, I used to do this. I now use transparent plastic cups with some little holes punched in the bottom. They don't sag and tear when they get wet, and you see if the seedling is becoming rootbound.

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  • ericCycles commented on ankitdaf's instructable Getting Started with the ESP8266 ESP-129 months ago
    Getting Started with the ESP8266 ESP-12

    were you seeing the led flash when it powered up? My led isn't lighting up. I'll try flashing a program next.

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  • ericCycles commented on Vulcaman's instructable DIY-SLS-3D-Printer1 year ago
    DIY-SLS-3D-Printer

    My understanding is that commercial units have heaters for the beds so that the printing material is raised up to temperature just below the melting point so that laser beam just has to put-it-over-the-edge. Ie, lets you use a lower powered laser for a particular material.

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