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Meaningness's profile
David Chapman
David Chapman
David Chapman
@Meaningness

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David Chapman

@Meaningness

Better ways of thinking, feeling, and acting—around problems of meaning and meaninglessness; self and society; ethics, purpose, and value.

meaningness.com/about-my-sites
Joined September 2010

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    1. David Chapman‏ @Meaningness May 21
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      David Chapman Retweeted Rob MacLachlan

      Fascinating discussion of the nebulosity of electronic components featuring @robamacl and @mattskala. You don’t have to understand anything about electronics to get the key points (I hope! I don’t understand anything about electronics…) Starting here:https://twitter.com/robamacl/status/1263505028591095808 …

      David Chapman added,

      Rob MacLachlan @robamacl
      Replying to @Meaningness
      Just yesterday I was struggling with a particularly nebulous component, the ferrite bead. At the material level it is dead simple, a bit of ceramic and a wire. At first it was simply a rod with a hole in it, you usually slipped out over the lead of a transistor.
      1 reply 2 retweets 12 likes
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    2. David Chapman‏ @Meaningness May 21
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      David Chapman Retweeted Rob MacLachlan

      So if I’m following this correctly, the use of ferrite beads is largely empirical, and not just that, but pretty much one-off, because their behavior isn’t well-characterized. There are spec sheets, but those are often not meaningful in practice.https://twitter.com/robamacl/status/1263506985338703877 …

      David Chapman added,

      Rob MacLachlan @robamacl
      Replying to @robamacl @Meaningness
      Ppl did this, and found that it sometimes helped things to work when you had an oscillation or interference. But beads came in different mechanical sizes, and can be made from different ferrite recipes. Experts said they are good, get an assortment and try them out.
      2 replies 0 retweets 4 likes
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    3. Matthew Skala  😷‏ @mattskala May 21
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      Replying to @Meaningness @robamacl

      Well, a critical variable is cost. If you throw beads onto a bunch of wires where they are probably not necessary, you can significantly increase the chance your product will work on the first try. But if you want "minimum viable bead," discovering it will take trial and error.

      1 reply 0 retweets 0 likes
    4. Matthew Skala  😷‏ @mattskala May 21
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      Replying to @mattskala @Meaningness @robamacl

      This point feels similar to the issue in comp sci theory that it's often much easier to approximate the answer to a hard problem - even quite well, and with a guaranteed approximation factor - than to really get the exact answer.

      1 reply 0 retweets 0 likes
      David Chapman‏ @Meaningness May 21
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      Replying to @mattskala @robamacl

      Is that what’s going on here? My impression from what Rob was saying—I might have got this wrong—is that some aspects of bead behavior aren’t typically characterized even to within a defined factor, so you have to just try them and see?

      1:23 PM - 21 May 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Matthew Skala  😷‏ @mattskala May 21
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          Replying to @Meaningness @robamacl

          I think both statements are true. The *really* uncharacterized stuff only becomes relevant in certain applications. In most applications, it can be swept under the rug by erring on the side of caution. Compare the thing about pulse power rating in the resistor article...

          1 reply 0 retweets 0 likes
        3. Matthew Skala  😷‏ @mattskala May 21
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          Replying to @mattskala @Meaningness @robamacl

          Most people aren't applying high-power pulses to resistors. You can deal with that by NOT applying high-power pulses, and by knowing that you shouldn't; or by using a resistor specified for a lot more general-purpose power than you need and hoping it can handle the pulses too;

          1 reply 0 retweets 0 likes
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