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    Home Based Income as an Electronics Hobbyist

    Hi :) I tried this in the 1980's. Rather than chasing dollars I tried to provide service, and made some friends thereby. I found a niche market in a power supply I designed for bone carvers, who produce a lot of jewellery in my native Aotearoa - New Zealand. I only ever actually sold 2 (which...
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    110 220V detection

    A simple multi pole relay, energised by the higher voltage, would switch your heaters within a few milliseconds.
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    Need help w/ home stereo

    :) Hi Is there a stereo input jack on the amp? (Telling us more about the amp might help - at least good photos or a link to a good description of it ) Mk
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    Not sure what sensor to use

    3 loops with different resonances, set up all at right angles, might be excited by a pulse. At least 3 detectors are needed I suppose. As for processing the information I believe the modern solution would be AI, which for me takes the fun out of everything.
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    Magnifying tool for tiny circuit boards and surface mount?

    I'd be looking for a jewellers loupe. I've tried using a stereo microscope (on an industrial board) and I think the loupe is probably better. Passive glass lens technology is still available :)
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    Not sure what sensor to use

    You could embed 3 miniature microphones in a die, and send the sounds from them by radio to an AI. With training the AI will be able to provide the final orientation of the die. I guess that makes it easy?
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    Microwave ovens ?

    I have seen that "sometimes...?" a high voltage capacitor in the magnetron circuit of a microwave oven goes short circuit, so maybe there is a chance of finding a good magnetron in a junked oven.
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