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Old 12th September 2005, 10:22 PM   #1011
dqswim is offline dqswim  United States
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The dog days of summer are nearly over.

Something must be brewing here or on passdiy for the fall!
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Old 13th September 2005, 05:54 PM   #1012
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Yes, we ran out of little paper umbrellas for our drinks on the
beach, so now it's back to work.

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Old 13th September 2005, 06:04 PM   #1013
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Quote:
Originally posted by dqswim
[B]The dog days of summer are nearly over.B]
"Today, dog days occur during the period between July 3 and August 11."

"In the summer, however, Sirius, the “dog star,” rises and sets with the sun. During late July Sirius is in conjunction with the sun, and the ancients believed that its heat added to the heat of the sun, creating a stretch of hot and sultry weather. They named this period of time, from 20 days before the conjunction to 20 days after, “dog days” after the dog star."


Silly me, I thought it meant the hot, humid, windless days near the end of summer.

Cal
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Old 15th September 2005, 04:28 PM   #1014
dqswim is offline dqswim  United States
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Thanks for the good reading, i like the zen variation 8 and the PLH amplifier now posted on passdiy.

That will give me something to do at work today.
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Old 28th September 2005, 07:28 AM   #1015
maney is offline maney  United States
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Quote:
Originally posted by Variac some time ago

I told Kent of a story I heard, that during lunch some grad students hung a piece of aluminum foil in the gap of the magnet and sent a signal through it. Of COURSE the sound was to die for.. I don't know if the actual layout of a cyclotron would allow this...
This is the traditional origin anecdote for [true] ribbon speakers. It's been so many decades that I can't remember which Chicago-area lab it was supposed to have happened at when I first heard it, or just which piece of HE physics gear was reputed to have provided the physically large gap with intense, linear magnetic field. I imagine those details change from telling to telling.

Ten to one it's apocryphal...but I do know some HE physics sorts who are pretty deeply into good sound reproduction, so I won't say it's impossible. Hmmm. I wonder if Dan is still working at Fermi...
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Old 28th September 2005, 09:04 PM   #1016
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When I was at ESS I experimented with an actual tweeter
which operated on a similar principle. A circular lightweight
foil diaphragm is placed between two coils, one front and one
back, all aligned to the same plane. When you run current
through the coils and modulate it, the eddy currents in the
diaphragm cause it to push air. The concept came from an
old acoustics journal, and I simply implemented the original
drawings. I also tried iron oxide coated mylar sheet as a
diaphragm.

As a loudspeaker, it was not a practical item.

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Old 28th September 2005, 10:39 PM   #1017
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The eddy current driver sounds as though it would be inefficient. On the other hand, it might be just the ticket for a CCS amp.
Assuming that iron oxide coated mylar means magnetic recording tape, I have experimented with this with fair results. It's inefficient. Conceptually, I think it's likely that the iron oxide will experience a hysteresis effect, which would surely lead to distortion, but I don't remember it being audible.

Grey
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Old 12th December 2005, 02:24 AM   #1018
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Speaking of inefficient, I'm still waiting for Nelson to develop an efficient version of the speakers he had at CES over 20 years ago.... the ones that used the air between the grids as a diaphragm.... he's had plenty of time now!

He-he-heee....
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Old 12th December 2005, 02:50 AM   #1019
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That's not all that difficult...raise the voltage. But it will also become a more efficient source of ozone in the process.

Grey

(Nix Fingerpokin, indeed...more like Nix Inhalin')
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Old 27th December 2005, 03:52 PM   #1020
moe29 is offline moe29  United States
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Default New Line Stage?

Any chance of a new line stage that uses the power JFETS?

Would the power JFET be an improvement over the MOSFETS used in
the BZLS?

Or am i asking a really stupid question! LOL
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