DIY progress report - Page 102 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 13th September 2005, 04:54 PM   #1011
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
Yes, we ran out of little paper umbrellas for our drinks on the
beach, so now it's back to work.

  Reply With Quote
Old 13th September 2005, 05:04 PM   #1012
diyAudio Moderator
Cal Weldon's Avatar
Join Date: Jan 2004
Location: Near Vancouver
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.

planet10 needs your help:
Let's help Ruth and Dave
  Reply With Quote
Old 15th September 2005, 03:28 PM   #1013
dqswim is offline dqswim  United States
diyAudio Member
Join Date: Nov 2003
Location: il
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.
  Reply With Quote
Old 28th September 2005, 06:28 AM   #1014
maney is offline maney  United States
diyAudio Member
Join Date: Sep 2005
Send a message via AIM to maney Send a message via MSN to maney Send a message via Yahoo to maney
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...
  Reply With Quote
Old 28th September 2005, 08:04 PM   #1015
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
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

As a loudspeaker, it was not a practical item.

  Reply With Quote
Old 28th September 2005, 09:39 PM   #1016
diyAudio Member
Join Date: Feb 2001
Location: Columbia, SC
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.

  Reply With Quote
Old 12th December 2005, 01:24 AM   #1017
diyAudio Member
Join Date: Jun 2004
Location: Wylie, Texas
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!

  Reply With Quote
Old 12th December 2005, 01:50 AM   #1018
diyAudio Member
Join Date: Feb 2001
Location: Columbia, SC
That's not all that difficult...raise the voltage. But it will also become a more efficient source of ozone in the process.


(Nix Fingerpokin, indeed...more like Nix Inhalin')
  Reply With Quote
Old 27th December 2005, 02:52 PM   #1019
moe29 is offline moe29  United States
diyAudio Member
moe29's Avatar
Join Date: Dec 2002
Location: Florida
Send a message via AIM to moe29 Send a message via Yahoo to moe29
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
  Reply With Quote
Old 27th December 2005, 06:12 PM   #1020
Blues is offline Blues  United States
diyAudio Member
Blues's Avatar
Join Date: Sep 2003
Location: The Milky Way
Good idea Moe. This would probably spur me on to build me a preamp. A jfet BZLS would be very nice indeed.
Life simplified! Leap into the Warpspeed wormhole...
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

New To Site? Need Help?

All times are GMT. The time now is 11:49 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2