Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

The Lounge A place to talk about almost anything but politics and religion.

John Curl's Blowtorch preamplifier part II
John Curl's Blowtorch preamplifier part II
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 September 2009, 07:55 PM   #881
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: The great city of Turnhout, BE
Quote:
Originally Posted by scott wurcer View Post
[snip] It was considered unpublishable as an application.
Of course, god saves us from people leaving the trodden road. Safer to stay with the 30+ years old stuff

jd
__________________
Music is dither to the brain; lets me think below the usual chaos - me
Get more Linear Audio for less! Check out my Autoranger and SilentSwitcher
  Reply With Quote
Old 2nd September 2009, 08:18 PM   #882
dimitri is offline dimitri  United States
diyAudio Member
 
dimitri's Avatar
 
Join Date: Oct 2002
Location: retired
Send a message via ICQ to dimitri
Quote:
putting 1/2 the DC RIAA resistor to ground
agreed, this will work, floating (differential) RIAA network across pin 8's - wouldn't
  Reply With Quote
Old 2nd September 2009, 09:04 PM   #883
john curl is offline john curl  United States
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
It is still: The three phases of an idea.

1. It won't work. Too much distortion, gain instability, etc
2. It works, but it is not important. Tested it at X100, didn't bother to follow up.
3. We invented it. I would have done it even better and quieter, if I really wanted to.
How about that everyone?
__________________
"Condemnation without Examination is Prejudice"
  Reply With Quote
Old 2nd September 2009, 09:08 PM   #884
Bob Cordell is offline Bob Cordell  United States
diyAudio Member
 
Join Date: Sep 2006
Quote:
Originally Posted by john curl View Post
look at fig 3, Bob, and tell me what you see. Can YOU give the source of every 'blip' on the screen?
I see a blip. So what? I certainly can't give a source for every blip on the screen. That is your responsibility because you are the one asserting that it distinguishes TIM from PIM. I don't know that it does, and I don't think you do either.

Cheers,
Bob
  Reply With Quote
Old 2nd September 2009, 09:13 PM   #885
scott wurcer is offline scott wurcer  United States
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: dorchester ma
John Curl's Blowtorch preamplifier part II
Pretty mean spirited response for a few of us throwing around ideas. Yes, Walt and I played around with a bunch of "using op-amps open-loop" ideas. They weren't really of general interest in real instrumentation.
__________________
"The question of who is right and who is wrong has seemed to me always too small to be worth a moment's thought, while the question of what is right and what is wrong has seemed all-important."
  Reply With Quote
Old 2nd September 2009, 09:21 PM   #886
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: The great city of Turnhout, BE
Quote:
Originally Posted by scott wurcer View Post
Pretty mean spirited response for a few of us throwing around ideas. Yes, Walt and I played around with a bunch of "using op-amps open-loop" ideas. They weren't really of general interest in real instrumentation.
Scott, to make myself clear in case this was referred to my earlier response, I wasn't referring to you but to 'management' in general. I know you like to explore the untrodden road. Wish I had such a wide brain as you have...

cheers,

jd
__________________
Music is dither to the brain; lets me think below the usual chaos - me
Get more Linear Audio for less! Check out my Autoranger and SilentSwitcher
  Reply With Quote
Old 2nd September 2009, 10:47 PM   #887
john curl is offline john curl  United States
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
Bessel function re FM modulation? Bob.
__________________
"Condemnation without Examination is Prejudice"
  Reply With Quote
Old 2nd September 2009, 10:49 PM   #888
Wavebourn is offline Wavebourn  United States
Designer & Technologist
diyAudio Member
 
Wavebourn's Avatar
 
Join Date: Sep 2006
Location: Pleasant Hill, CA
John Curl's Blowtorch preamplifier part II
Quote:
Originally Posted by janneman View Post
Uhhh.... making $ 24800 with a $8 opamp?
Like, "$1 for knocking the nail, and $999,999 for knowing which one to knock".
  Reply With Quote
Old 2nd September 2009, 10:58 PM   #889
Bob Cordell is offline Bob Cordell  United States
diyAudio Member
 
Join Date: Sep 2006
Quote:
Originally Posted by john curl View Post
Bessel function re FM modulation? Bob.
John, you are name-dropping again:-)

Yes I remember Bessel functions and the accompanying pain. You did not read my earlier post very well. I stated that any PIM distortion was akin to narrow-band fm. Go look up narrow band fm. The Bessel functions devolve to linear functions at low deviation.

Bob
  Reply With Quote
Old 2nd September 2009, 11:15 PM   #890
john curl is offline john curl  United States
diyAudio Member
 
john curl's Avatar
 
Join Date: Jul 2003
Location: berkeley ca
The extra distortion products appear to follow a low order Bessel function, which is superimposed on the normal IM byproducts. Anyone out there have enough knowledge to contribute to this discussion?
__________________
"Condemnation without Examination is Prejudice"
  Reply With Quote

Reply


John Curl's Blowtorch preamplifier part IIHide 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

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 05:12 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki