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Cake day: February 1st, 2024

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  • qjkxbmwvz@startrek.websiteto196@lemmy.blahaj.zonemrrp rule
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    2 months 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 :)















  • If you really want to try some, you could use d-limonene. It’s just orange oil (like you get when you squeeze an orange peel), is edible, and is basically a kerosene-like hydrocarbon. It’s used in hand soap and works for stripping paint, and you can run multi-fuel camp stoves off of it, too!

    Careful ingesting it though, as it isn’t always food grade due to extraction methods/additives. It causes kidney tumors in rats, but the mechanism is known and is not relevant to humans.