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Joined 2 years ago
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Cake day: July 3rd, 2023

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  • 2kg of CO2? Atomic weight of CO2 is about 44, of which carbon is 12, so 27% of CO2 is the carbon from the gasoline. I know that gasoline contains more than just hydrocarbon chains, and that the chains also contain hydrogen. But for the sake of this back of the envelope calculation I’ll disregard both.

    27% of 2kg is 0.54kg, according to https://en.wikipedia.org/wiki/Gasoline a liter of gasoline is 0.755kg. Aka 2kg of CO2 is the result of burning 0.72L of gasoline. Driving 4miles, or 6.44km on 0.72L is 9km/L, or 21.2mpg. 1.6kg of CO2 would be 0.57L and 11.3km/L or 26.6mpg.

    Maybe I shouldn’t have disregarded the additives and the hydrogen, but unless they account for about 50% of the weight of the gasoline, then those 4 miles were driven in a something very uneconomic.








  • It’s not Denmark, it’s our PM. She’s a power hungry a-hole who can’t keep power without inciting fear in people. She milked covid for all she could. Then Russia invaded Ukraine and we started donating a lot. I fully support donating military equipment to Ukraine, but I can tell from Danish news media that some of my fellow Danes are starting to drink the Russian “we can’t afford to help Ukraine when our butter is so expensive”-gatorade. So she needs something else now, with parliamentary elections less than a year away, our dear leader has decided to go all in on “won’t somebody think of the children”, “immigration is bad, and all foreigners are immigrants”, and “justice, both in social benefits and crime”

    So the tldr on why Denmark is being a totalitarian prick at the moment is, that our PM is a fading star desperately trying to get reelected.



  • If you’re designing for production then talk with the assembly guys, they will have options and cost estimates.

    If we’re talking a one of, then just try. It’s only 500mm so not that much can happen. Especially at the slow speeds you mentioned. 20kHz isn’t that fast compared to the +100MHz that a cat5e is designed for when using differential signalling.

    Are plugs a must? If not I’d consider soldering the wires. At least for testing the cable’s suitability.

    If you must use plugs, then don’t use rj45. Some yahoo, like yours truly, will come along and go “neat, an undocumented ethernet capability” and fry something expensive. Have a look around DigiKey or where you get your parts, and find a less common plug.

    And if you end up needing more wires, then get an old parallel ATA HDD cable from the early 2000s. They have 80 wires and are free at the dump.