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Cake day: June 22nd, 2023

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  • solrize@lemmy.mlOPtoflashlight@lemmy.worldCell welder advice?
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    5 days ago

    Thanks! There is a Torque Test channel video where they tested Milwaukee and Ryobi jump starters and found they delivered around 4WH and 3WH of energy respectively. They use a tool battery to charge a capacitor, then use the capacitor to jump start the motor. I thought I had seen a teardown of the Ryobi once, that showed the capacitance, but I don’t seem to have saved a link. But let’s see, E= 4WH = 14.4kJ = 1/2CV^2 where let’s say V is initially 14.14 volts so 1/2 C V^2 = 1/2 C 200 = 100C = 14400J. So C = 144 farads, can that be right? They are supercapacitors after all, and the jump starter is a fairly large box of them.

    Here’s the jump starter test vid: https://www.youtube.com/watch?v=z4N5txe7oZA

    This claims to be a 100 farad 13.5V capacitor bank (5x 500 farad 2.7V in series): https://www.aliexpress.us/item/3256804444528644.html

    The jump starters are a fair amount bigger than that bank.


  • Hard to pierce pseudonymity doesn’t interest me that much, because it’s bad enough having all your posts connected together.

    I want something like 4chan (but heavily moderated), where all posts are just marked “Anonymous” and if you make 3 different comments, it’s not publicly shown that they came from the same person. It’s ok to retain the info privately for a short period, for moderation purposes. It could be ok to assign a persistent pseudonym for each thread, so if you comment 3 times in the same thread, those comments are connected to each other, but not to other comments in other threads.

    This is a good article about the attractions of completely anonymous posting, though it’s from the pre-supertoxic internet era: https://wakaba.c3.cx/shii/shiichan









  • In the US, the cover (as long as it doesn’t mess up the song too much) is automatically allowed, as long as you pay what is called a compulsory royalty (a certain amount per record sold, or per audience member in case of a live performance). ASCAP and/or the Harry Fox Agency (iirc) act among other things as clearinghouses for these payments. You have to notify them ahead of time of the cover you’re releasing, and maybe pay something up front.

    Normally if you seek permission from the publisher of the song you want to cover, it’s because you want to negotiate a lower royalty than the compulsory one. You can often do that if you can convince them that your record is going to sell a lot of copies. It’s just a discussion about money and business people are used to that.

    If your performance copies from the original but is not a straightforward cover, then you do need permission ahead of time as the compulsory license doesn’t apply, with some limited free-speech exceptions for parodies.

    IANAL bla bla bla.

    https://en.wikipedia.org/wiki/Compulsory_license#United_States