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  • 12 Comments
Joined 1 year ago
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Cake day: June 6th, 2023

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  • In almost all microwaves, the control circuitry or mechanical switches only ever switch 2-3 power circuits: motor+fan(+bulb sometimes separately) and the heating (transformer+diode+capacitor+magnetron) high voltage circuit. It can therefore only switch the heat between 0 and max, usually in a slow (15-30s period) PWM cycle (that hopefully does not coincide with the tray rotation period). The inputs can be manual only, or sometimes there is also a scale, moisture sensor and microphone, along with thermal fuses for safety.

    I think the pizza setting is just generic medium one with short 50% cycles to allow the heat to spread. The popcorn setting can be much more interesting:
    https://www.youtube.com/watch?v=Limpr1L8Pss




  • This is GRUB’s final warning before you dig too deep in the OS list. Never hold ⬇️ for more than 45 minutes. If you do, make sure you have punch tape with a bootloader available or you’ll have to manually enter machine code instructions to get your computer back up.



  • I am not aware of any receipt printers using lasers - thermal printers have an array of resistors that get hot when necessary. I know how a laser printer works and it is hard to explain in 12 or so words. Inkjets are way easier, you can just say “squirt squirt oops”. Anyway…

    1. A photosensitive drum gets a negative electrostatic charge.
    2. A laser shining through a rotating prism scans lines across the drum’s surface. This removes charge from parts of the drum that should not be covered in toner.
    3. A high-voltage corona wire inside the toner reservoir charges an amount of toner positively.
    4. The charged drum rotates past the corona wire, getting covered in toner where its negative charge remains.
    5. Paper is pushed against the drum and the powdery toner is transferred to it.
    6. The paper continues into a fuser, a little oven where a heating element briefly makes the toner so hot that it melts, its powder particles making a permanent bond among themselves and with the paper. (The heater is usually stationary and heats the paper from below. The fuser drum that pushes paper against the heater can get sticky and pick up some of the toner, making images repeat down the page. This is the most common failure mode that cannot be resolved through regular maintenance such as replacing the toner cartridge and printing cleaning pages. However, almost all laser printers have a cheap fuser module or its drum available so it is usually worth replacing.)


  • Here is the auto-generated transcript (for research purposes only)

    oh isn’t it a beautiful day how cutie
    the sun’s bright the birds are singing
    nicely it’s a good as day as any to go
    and touch
    grass yeah I I know I know um it’s
    important though I need to go to the
    store it’s been a while and you know
    replenish the
    pantry um it’ll be okay though I promise
    I’ll be back soon it shouldn’t take too
    long and no no you don’t you please
    don’t come with me I can touch enough
    grass for the both of us and I promise
    I’ll be back soon okay nothing bad’s
    going to
    happen but in case I don’t come back
    please feed
    mocha and take care of her for
    me
    no I’ve got to go now before I check it
    out I’ll I’ll see you later okay you
    just stay nice and safe inside
    okay good
    cutie all right that was easy got
    everything I need yeah okay I’ve got to
    hurry home now uh I’ve probably got to
    switch out the cuties
    bandages maybe we refill the ice pack
    and ah goodness oh I didn’t see that
    puddle it was surprisingly deep and now
    my boots are
    muddy that’s okay though once I get home
    I can wipe them huh holy goodness
    gracious why is no one watching where
    they’re going right now I almost dropped
    the eggs all right well that’s okay
    anyways it’s that a car please bra
    out think I’m okay oh no not another one
    the in my
    ankles no please stop this way please no
    happens I need to get
    home if I can make it
    home