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Joined 11 months ago
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Cake day: December 26th, 2023

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  • The actual difference between a working new mouse and a failing double click mouse is in the button itself (mechanical parts are almost always the problem).

    However, it is not some exotic failure mode. All mechanical switches have a “bounce”, where the contact makes and breaks a few times before settling into the connected position. Switches are typically designed to make the actual contact spring loaded (which is the origin of the click sound you here). As they age, this mechanism degrades, making the bouncing problem worse.

    However, this is a well understood problem that any electrical engineer should be familiar with. One solution is to install a filter capacitor. Now it takes longer to switch between the on and off state, so the inherent bounce in the switch is smoothed out to the point where you cannot detect it.

    They probably did testing with a new switch, and decided that they didn’t need to include any explicit debounce component, ignoring the fact that the switch would degrade over its lifetime.



  • In addition to the raw compute power, the HP laptop comes with a:

    • monitor
    • keyboard/trackpad
    • charger
    • windows 11
    • active cooling system
    • enclosure

    I’ve been looking for a lapdock [0], and the absolute low-end of the market goes for over $200, which is already more expensive than the hp laptop despite spending no money on any actual compute components.

    Granted, this is because lapdocks are a fairly niche product that are almost always either a luxury purchase (individual users) or a rounding error (datacenter users)

    [0] Keyboard/monitor combo in a laptop form factor, but without a built in computer. It is intended to be used as an interface to an external computer (typically a smartphone or rackmounted server).




  • At a $188 price point. An additional 4GB of memory would probably add ~$10 to the cost, which is over a 5% increase. However, that is not the only component they cheaped out on. The linked unit also only has 64GB of storage, which they should probably increase to have a usable system …

    And soon you find that you just reinvented a mid-market device instead of the low-market device you were trying to sell.

    4GB of ram is still plenty to have a functioning computer. It will not be as capable of a more powerful computer, but that comes with the territory of buying the low cost version of a product.


  • homura1650@lemm.eetoxkcd@lemmy.worldxkcd #2947: Pascal's Wager Triangle
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    5 months ago

    Blaise Pascal is famous for 2 things:

    1. Pascal’s triangle. This describes how to expand expresions of the form (a+b)^n as well as to compute how many ways there are to pick k objects out of a set of n (ignoring order.

    This triangle is computed by starting with 1 at the tip, then having each element be the some of its 2 parents (except the diagonal edges with only one parent, which remains as 1)

    1. Pascal’s wager. This is a theological argument for a belief in god that goes “if you believe and god doesn’t exist, nothing happens. If you don’t believe and he does exist, you suffer for eternity. The logical choice is therefore to believe”

    The natural conclusion is therefore to believe in all gods. If procelatizing happens in just the right way, and no one realizes people are talking about the same god, you end up with a triangle of polytheists, where the number of gods they believe in is given by Pascal’s triangle.

    Edit: gid -> god






  • There are still a lot of rather arbitrary decisions to make.

    Is 4/pi inside or outside of the summation?

    Is it (-1)^n+1 or (-1)^n with an additional negative sign in any of the other natural locations for it.

    Is the e term outside of the fraction with a negative exponent, or part of the denominator.

    Do you start with n=0 or n=1 (and adjust the terms inside the summation accordingly)

    Did they expand (2n+1)^2?







  • Agree on going with safty razors, but once you are there, you don’t want to cheep out. The one option my local grocery store carries is a $20 that is complete junk. I invested $70 in a Henson safty razor and never looked back. They also have a $250 offering for people who want the benefits of a safty razor without the cost savings.

    For blades, I actually splurge and buy the $0.20/piece offering from Feather instead of the $0.10/piece ones that Henson sells. Still cheeper than the $0.80 safty blades the grocery store sells, or the checks app $4.50/piece cartridge blades the store sells?!?

    Moral of the story: go cheap, but don’t be afraid of spending a little money to do so.


  • homura1650@lemm.eetoxkcd@lemmy.worldxkcd #2876: Range Safety
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    11 months ago

    I have a coworker who used to work on safty critical systems. On every system, she would write a report on what they would have to do to kill someone with it.

    Remember folks, the range danger officer is a very important position. If he ever tells you to do what you are about to do then be sure to: pause; think about what you are about to do; do not do it.