Comments by "" (@GoatZilla) on "Two Bit da Vinci" channel.

  1. Just at a cursory glance, can we just say they're sacrificing magnets for copper? That doesn't seem like a good trade.
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  2. One of the other problems with capacitors is their voltage changes drastically over their cycle. If you want to pull the most energy out of a capacitor, you're going to need to tolerate a huge voltage swing. That makes them really tricky to use for anything other than signal filtering or blasting stuff.
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  3.  @PeterLawton  Sure. So what situation have you found that perspective useful?
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  4.  @PeterLawton  The specific supercaps in this video are relatively new, but as a general category supercaps have been widely available for decades. For a battery, the energy rating covers the voltage swing, which again is more limited which makes design easier. For a capacitor, the energy rating covers pretty much the entire voltage range, which is literally orders of magnitude higher than the swing for a battery. It's a serious issue and inverting the perspective gets you nowhere. Just saying, "Oh well we'll design stuff to fix that" is begging the question. I know car guys like to think "I use big examples because I'm a big thinker and my ideas are big" but even in the small cases supercaps are hard to use. Say if you want to replace an RTC coin cell with a supercap, well, you can't just put a supercap in there because the RTC expects a much smaller voltage swing so if you want it to actually be worth anything, you either waste a ton of capacity (which already you don't have enough of) or you have to both boost and regulate (increasing cost and again effectively reducing capacity). Try actually doing it and you'll understand. Today. The only time that voltage swing is useful is for gauging remaining capacity, which can be tricky for many battery chemistries.
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  5. not again
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  6. Uh, should not be using sand that would be used in construction. Should be using sand that wouldn't be used in construction.
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