Go Back   Home > Forums > Amplifiers > Pass Labs

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
Reply
 
Thread Tools Search this Thread
Old 2nd November 2009, 05:06 PM   #41
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
Quote:
Originally Posted by flg View Post
O.K. I think we've all seen the Depletion Mode MOSFET Zen Lite variant displayed by N.P. at BA'09. Personally, I did not know that part existed? But, it appears to have some quite conveniant qualities:
Suitable Voltage rating, Current rating, self biasing like the LU1014D, "Idss" of about 2.5A, Rthjc .31 C/W, plenty of S.O.A., fairly linear C in our typical operating range, and by all accounts so far, fairly linear and good sounding. Oh yea, affordable price in small enough orders. Did I miss something?
I'm not so interested in another Zen Lite but as I've seen recently, I'm not the only one interested in creating a monster B1 circuit. I was thinking of paralelled LU1014Ds with car battery rails. This device can take that idea further and easier as Paul Hynes did a few years ago (someone posted an AudioCircle link around here somewhere). I've also played with the Circlotron circuit quite a bit and it's very nice but, with self biasing and ground refrenced input as Paul Hynes has already done also wow
Personally, I can't wait to play with this part. There is a GB thread started to research the interest in obtaining some.
So, I thought I'ld get us all started on a discussion for everyone's benifit. Oh, yea, another great quality, N.P. seems to like this part too...
Any other comments? questions? previous experiance? Ideas?
I have found a distortion removal circuit of the japanese URL
Distortion removal circuit
this circuit could be very interesting for the new IXYS MOSFETs after performing the appropriate modifications for depletion mode versions.
Here the automatic translation in English
Google Übersetzer

Last edited by tiefbassuebertr; 2nd November 2009 at 05:08 PM.
  Reply With Quote
Old 19th November 2009, 05:40 AM   #42
diyAudio Member
 
Join Date: Jan 2007
Location: Iowa
Sorry to dig up an old(ish) thread, but I didn't think this belonged in the "DeLite" thread, though the same device.

I am pinking up a few of these to play with (building a DeLite, just to simple to pass up), and had a quick question. Being depletion mode, could one build a bigger, higher current B1 out of these to drive speakers?

Also, I know you are a very busy man Mr. Pass, but any new news from Jack or about the transformer circuit?

Thanks!

James
  Reply With Quote
Old 19th November 2009, 09:49 AM   #43
flg is offline flg  United States
diyAudio Member
 
flg's Avatar
 
Join Date: Jul 2005
Location: North East
see post #2 Some ones been there done that
__________________
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
  Reply With Quote
Old 19th November 2009, 10:33 AM   #44
diyAudio Member
 
Join Date: May 2007
Hey flg,
Checked your simplified circuits and it won´t work as shown in the first figure with two similar(?) depletion mode above each other as you have drawn. To define drainvoltage of the lower device the upper FET may be arranged as a voltage-controlled gyrator. Just a matter of adding a few components.

What might be the the biggest challenge is to deal with the high Ciss of the IXTH20N50D that Nelson used. About double of a IRFP240. Maybe one of smaller IXYS with lower Ciss could be used....

Last edited by revintage; 19th November 2009 at 10:49 AM.
  Reply With Quote
Old 19th November 2009, 11:15 AM   #45
flg is offline flg  United States
diyAudio Member
 
flg's Avatar
 
Join Date: Jul 2005
Location: North East
Well, they were "simplified" idea's. I left some obvious parts out
__________________
"It was the perfect high end audio product: Exotic, inefficient, expensive, unavailable, and toxic." N.P.
  Reply With Quote
Old 19th November 2009, 11:22 AM   #46
diyAudio Member
 
Join Date: May 2007
Still I think we have something going here. Will do an "expanded" schematic of your fig. 1 together with a few sims to get some indications.
  Reply With Quote
Old 19th November 2009, 03:08 PM   #47
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Quote:
Originally Posted by janneman View Post
Then I got in contact with Jack Elliano of Electraprint Audio. He can do one for about $ 75, and he is willing to sell me a prototype which can be tested and then if necessary to be returned to him for final design. However, the shipping to my home in Holland is $ 50 each way, so I may end up with $ 100 in shipping for a $ 75 xformer. Since I have a perfectly working Nemesis with the original xformers, I think I'll pass for the new xformers.

I suggest that someone in the US will take this on, the shipping will be (much) less, but he/she must be able to measure the xformer as to freq response, undistorted power and preferably distortion versus frequency. Anybody game?
A pair of these just arrived from Jack. I'll let you know
how they work out.

  Reply With Quote
Old 19th November 2009, 03:25 PM   #48
diyAudio Member
 
Join Date: May 2007
Hey,
Are Jacks transformers also 2:1 as Nemesis?
  Reply With Quote
Old 19th November 2009, 04:50 PM   #49
diyAudio Member
 
Join Date: Jan 2007
Location: Iowa
Quote:
see post #2 Some ones been there done that
Wow, apparently I need to open my eyes, sorry HA, it even says "monster B1", terrible.


James
  Reply With Quote

Reply


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


Similar Threads
Thread Thread Starter Forum Replies Last Post
2sc3381-GR, Rubycon 410uF photoflash, and IXYS 1kv Depletion mode MOSFETS pabbi1 Swap Meet 3 27th June 2009 03:24 AM
Depletion mode mosfets for 2mA CCS ? mach1 Tubes / Valves 6 29th October 2008 08:50 PM
New Linear MOSFETs from IXYS Kashmire Pass Labs 3 27th April 2007 10:39 AM
n/p Mosfets vs depletion mod mosfets marcello7x Car Audio 6 4th October 2006 05:01 AM
IXYS mosfets ? woody Swap Meet 1 30th August 2003 06:25 AM


New To Site? Need Help?

All times are GMT. The time now is 11:25 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2