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Old 29th December 2016, 06:22 PM   #241
jrubins is offline jrubins  United States
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Quote:
Originally Posted by Bob Cordell View Post
Some folks expressed interest in seeing the slides from my Burning Amp 2016 presentation of the Hafler DH220C revamp using a full-complementary JFET input stage with a floating tail. It is a powerpoint file, and, unfortunately, it is over 7 MB, even zipped (zip compression of ppt files is negligible). I don't know of any easy way to post it here. Please email me if you would like a copy.



Cheers,

Bob

You should be able to "save as" or "print to" pdf, which is much more portable



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Old 29th December 2016, 06:30 PM   #242
delange is offline delange  Belgium
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Quote:
Originally Posted by Bob Cordell View Post
Some folks expressed interest in seeing the slides from my Burning Amp 2016 presentation of the Hafler DH220C revamp using a full-complementary JFET input stage with a floating tail. It is a powerpoint file, and, unfortunately, it is over 7 MB, even zipped (zip compression of ppt files is negligible). I don't know of any easy way to post it here. Please email me if you would like a copy.

Cheers,
Bob
Dropbox is an easy way to share files.
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Old 30th December 2016, 02:01 AM   #243
amb is offline amb  United States
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I am interested, and agree with the Dropbox solution.
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Old 30th December 2016, 02:38 AM   #244
Bob Cordell is offline Bob Cordell  United States
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Default Slides

Hi guys,

Here is a PDF of the slides, thanks to Mark Johnson.

Cheers,
Bob
Attached Files
File Type: pdf Cordell_BurningAmp2016_DH220C (1).pdf (413.3 KB, 209 views)
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Old 30th December 2016, 02:43 AM   #245
linuxworks is offline linuxworks  United States
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400k file and its perfectly fine.

good that export-to-pdf was the easy win

it goes to show: rarely is it a good idea to use microsoft file formats to share files to the world. pdf at the resolution you used was perfectly fine.

cheers
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Old 30th December 2016, 08:12 AM   #246
dady is offline dady  Balearic Islands
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Quote:
Originally Posted by Bob Cordell View Post
Hi guys,

Here is a PDF of the slides, thanks to Mark Johnson.

Cheers,
Bob
Thanks for share.
Happy new year for you.
Happy Christian new year for Dad and the rest of gentlemen of this fantastic community.
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Old 30th December 2016, 10:18 AM   #247
amb is offline amb  United States
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Thanks Bob Cordell!
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Old 30th December 2016, 11:53 AM   #248
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Bob Cordell View Post
Hi guys,

Here is a PDF of the slides, thanks to Mark Johnson.

Cheers,
Bob
Thank you for all your efforts to get these posted.
You used 489 and 689 dual jFETs.
Can k170/j74 be substituted? or k389/j109?
What performance would deteriorate with this substitution?
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Last edited by AndrewT; 30th December 2016 at 12:06 PM.
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Old 30th December 2016, 12:50 PM   #249
Variac is online now Variac  Costa Rica
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Burning Amp 2016
Was great fun to be there as Bob summed up the specs he'd gotten after following thorough the process! Not Bad!
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Old 30th December 2016, 01:12 PM   #250
Bob Cordell is offline Bob Cordell  United States
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Quote:
Originally Posted by AndrewT View Post
Thank you for all your efforts to get these posted.
You used 489 and 689 dual jFETs.
Can k170/j74 be substituted? or k389/j109?
What performance would deteriorate with this substitution?
In principal, these substitutions can be made in this architecture with appropriate changes to some passive component values, especially the tail resistor. However, there is little benefit unless you already have those parts hanging around (most are no longer available). A key issue is that you really want dual monolithic matched pairs for the P and N JFETs. The hassle of matching and changing component values is probably not worth it. Although the parts you mention have somewhat lower voltage noise, the net reduction in noise by use of these larger-area JFETs is not great, since there are other contributors to noise. Moreover, with the LSK489/LSJ689, the amplifier already achieves very low noise for a power amplifier. The larger-die JFETs, like the k389, also have much higher capacitance.

Cheers,
Bob
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