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  • sbkenn commented on KirbyMeetsAudio's instructable Ceramic Speakers1 month ago
    Ceramic Speakers

    add a Bluetooth link and good PSU ?

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  • sbkenn commented on josemivaz's instructable Laser Printed PCB's, Perfect and Easy.1 month ago
    Laser Printed PCB's, Perfect and Easy.

    I always draw pads with a centre hole for drilling

    Better to mix acid with a base to make salt. Acid, even diluted, is not good for the environment, and in many cases, waste water is recycled these days.

    Copper is quite toxic too.

    I am actually way past even double sided PCBs anyway. Did that back in the 70s, quite successfully. Electronics and computers are of little interest beyond tools to get other things done. A lot of what I would have done, can be done with an Arduino these days. My next substantial project requires multiple, high efficiency multiphase, isolated Buck converters. That will need 4 layers.

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  • sbkenn commented on josemivaz's instructable Laser Printed PCB's, Perfect and Easy.2 months ago
    Laser Printed PCB's, Perfect and Easy.

    I have an old pen plotter. i wonder if a UV led with an optic fibre could be used to draw directly on a photo sensitive board. The resist is available in positive rather than the usual negative

    Depending on your enironment, hand tinned boards will tend to oxidise and sometimes the cooling solder will lift the tracks. There is a chemical deposition powder available. Either way, wrap the boards in clingfilm or a sealed bag if you dont plan on stuffing them fairly quickly.

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  • sbkenn commented on Christian Knuell's instructable Knife Block3 months ago
    Knife Block

    Contact your local SCA group if you want a market for them.

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  • sbkenn commented on NightHawkInLight's instructable Plasma Cutter From an Arc Lighter4 months ago
    Plasma Cutter From an Arc Lighter

    Drilling glass, use playdough to make the wet ring. If you know a welding shop, ask them for a tail-end of a tungsten electrode. I would also suggest making a small cavity over the glass, so the point of the electrode is a small distance from the glue. Without testing the thing, I don't know if it would work to have the cavity ventilated for electrode cooling

    Plasma is usually made from superheated (compressed) air or inert gas, so it isn't a really plasma. More like a minute oxy-acetylene cutter. Floats my boat though. Actually, that was done by the flood tide ;-)

    Ohh, and ignore the nay-sayers. At worst, this is a a nice starting point. Attach it to a plotter of 3D carriage for CNC

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  • Crossbow - Cross Country Ski Bow, if you prefer

    Nice job. Not a crossbow though.

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  • sbkenn commented on Prowlr's instructable How to Build the Fastest Quadcopter in 3 Hours5 months ago
    How to Build the Fastest Quadcopter in 3 Hours

    I wonder if anyone has built a hybrid, with an engine driving an PMalternator,/brushless motor for extended endurance.

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