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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => The Basement => Topic started by: Stu McDoniel on February 19, 2013, 04:01:55 PM
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This is cool
https://www.youtube.com/watch?v=OtM6XJlynkk
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Very nice.
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This is cool
https://www.youtube.com/watch?v=OtM6XJlynkk
Super
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This remindes me of when I was attending DeVry Tech in 1969. My "experiment" was to make a large capacitor, using 3 large sheets of glass, a roll of aluminum foil, and about 90V DC. I mostly wanted to see just how loud a "snap" I could make when I shorted it. Fortunately for all, the instructor came over and stopped my experiment. I shudder to think of what could have happened!
-Dennis
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Let's make a super crossover!
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Let's make a super crossover!
what is the design parameter?
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This is cool
https://www.youtube.com/watch?v=OtM6XJlynkk
There are so many things wrong with this video....
Can you imagine how thick the feeder cable would have to be in order to charge something like a Tesla S in a minute or so? (85 KWH battery pack. That'd be 5,100 KW minutes; so you'd have to pump in 5,100 KW for one minute for that suggested charge cycle assuming, of course, 100% conversion efficiency; My trailer-mounted generator puts out 60KVA, so imagine what it would take to produce 5.1GW to charge that Tesla [yeah, I know, a pair of Mr. Fusions, assuming each is capable of 2.21 "jiga" watts :)]).
It's cool that the supercap ran the LED for five minutes after "a couple seconds" charge. But what was the current? I see it's a 50% duty cycle, so it's really about two-and-a-half minutes, not five (assuming the duty cycle is even 50%).
Supercaps are great storage devices, but this video way oversteps the bounds of what reasonable and safe to do in the real world.
Cheers,
Randy Hyde
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I am not smart enough to know how close this is to being practical. We seem to forget or ignore the energy density of gasoline. A "Super" super-cap is nicer than a "Super" battery for some of the reasons they listed (less scary chemistry to worry about, still some pretty scary physics).
The recent grounding of the new Boeing dream liner fleet because of a battery problem, was more specifically a fire caused by an un-intended release of energy from that battery when a cell shorted out accidentally. A super capacitor could suffer the same catastrophic sudden discharge from a fault. Yes Virginia capacitors can short too.
Good for them, running a high efficiency LED for a few minutes is nice, but that same LED could run from a AA battery for hours, maybe a day.
While a capacitor can be charged much faster than a battery there will still be practical limits since you need to put a gas tank's worth of electrical energy into it in a matter of minutes. That is a lot of electrons and holes to push through some wires. They could do a trick similar to the high tension mains distribution power lines to step up and step down the voltage at the charging station to reduce current flow in the high voltage section, but UL may have an opinion about letting humans handle plugs with that much voltage.
clip---- deleted rant about govt subsidies for EV development and purchase--/clip
I still think the most promising EV approach for densely populated areas is to figure out how to energize the road surface, so the cars don't need so much energy storage capacity and can be made much lighter. On a larger scale if major highways were energized, even current EV battery technology could top themselves off when traveling unlimited distances on the interstate, and only need batteries (or whatever) for the last miles, to get them from the exit to the mall and back to the interstate again.
JR
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what is the design parameter?
128db/oct ;D
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There are so many things wrong with this video....
Can you imagine how thick the feeder cable would have to be in order to charge something like a Tesla S in a minute or so? (85 KWH battery pack. That'd be 5,100 KW minutes; so you'd have to pump in 5,100 KW for one minute for that suggested charge cycle assuming, of course, 100% conversion efficiency; My trailer-mounted generator puts out 60KVA, so imagine what it would take to produce 5.1GW to charge that Tesla [yeah, I know, a pair of Mr. Fusions, assuming each is capable of 2.21 "jiga" watts :)]).
It's cool that the supercap ran the LED for five minutes after "a couple seconds" charge. But what was the current? I see it's a 50% duty cycle, so it's really about two-and-a-half minutes, not five (assuming the duty cycle is even 50%).
Supercaps are great storage devices, but this video way oversteps the bounds of what reasonable and safe to do in the real world.
Cheers,
Randy Hyde
+1
I was thinking the same thing last night when I first saw this post (although without any hard numbers to back it up).
Sent from my Milestone X using Tapatalk 2
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128db/oct ;D
power handling?
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power handling?
lol... 10 iNukes, in parallel super bridge mode, clipping...
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There are so many things wrong with this video...
The video looked fine to me ;)
Yes, the guy made some claims that are a bit optimistic but the point is that this discovery could lead to faster charging power supplies for e devices and cars or motorcycles.
Maybe not to the extent he espoused but certainly better than what we have now and the process was not some esoteric, perfect lab conditions mechanism.
I'm sure if the Wright Bros claimed that their flying machine would lead to 500MPH, 400+ passenger jets people would have been reluctant to believe...at that time.
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lol... 10 iNukes, in parallel super bridge mode, clipping...
This xover would have to incorporate a combiner circuit.
Probably be only handle one speaker of a Disaster Area concert.
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So it need to be networkable because we are mixing in a bunker 8 miles away.
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lol... 10 iNukes, in parallel super bridge mode, clipping...
so, like 57 watts? ish...