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Cake day: February 1st, 2024

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  • qjkxbmwvz@startrek.websiteto196@lemmy.blahaj.zonemrrp rule
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    16 hours ago

    I have heard, but have trouble finding references to it, that you can build a simple arbitrary waveform generator circuit by using an analog scope, a photodiode, and a cardboard cutout.

    You make a photodiode circuit that rails high with no light, but light on the photodiode pushes the signal low. Then you aim this at the phosphor screen with a cardboard cutout of the desired waveform: signal goes up until the phosphor trace is above the screen, and then it gets pushed low (i.e., feedback keeps the trace right on the edge of the cardboard).

    Never seen it in action, but I choose to believe it works beautifully :)












  • I’ve been pleased with it. Family is very relaxed about projects like this, but yeah it’s low power draw. I don’t think I have anything special set up but the right thing to do for power would be to spin down drive when not in use, as power is dominated by the spinning rust.

    Uptime is great. Only hiccups are that it can choke when compiling the ZFS kernel modules, triggered on kernel updates. It’s an rpi 3/1GB RAM (I keep failing at forcing dkms to use only 1 thread, which would probably fix these hiccups 🤷).

    That said, it is managed by me, so sometimes errors go unnoticed. I had recent issues where I missed a week of rsync because I switched from pihole to technitium on my home server and forgot to point the remote rpi there. This would all have been fixed with proper cron email setup…I’m clearly not a professional :)






  • I wonder, legally, if there is a difference between the companies that simply raised prices, and the ones who kept the price the same but added another line item to the invoice that covered the tariff.

    IANAL, but for the former, it seems like the company may be entitled to keep the money (of course it’s morally wrong). For the latter though, it seems like maybe (???) there’s some stronger legal pressure on the companies.

    Or not. But at least CAH is doing the right thing, as others have pointed out!