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 III
John Curl's Blowtorch preamplifier part III
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 18th February 2018, 11:39 PM   #71
gpapag is offline gpapag  Greece
diyAudio Moderator
 
gpapag's Avatar
 
Join Date: Nov 2002
Location: Athens-Greece
John Curl's Blowtorch preamplifier part III
Quote:
Originally Posted by simon7000 View Post
George,
Am I missing something, I don't see a load resistor on the right input to the shell (ground.)
You are right Ed. I haven’t placed any external load resistor, as the card’s input impedance is 10kOhm, see first attachment.
The card’s output impedance (signal source) is 150 Ohm, see second attachment

George
Attached Images
File Type: png M-Audio Line-In Impedance.PNG (58.1 KB, 251 views)
File Type: png M-Audio Line-Out Impedance.PNG (51.3 KB, 251 views)
__________________
["Second Law is a bitch." - SY]
["I insist on respecting the means of the average person working in their garage/basement." -Scott Wurcer]
  Reply With Quote
Old 18th February 2018, 11:45 PM   #72
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Quote:
Originally Posted by scottjoplin View Post
Not really, they might be trapped, no one is trapped here. I remember someone a while ago on this forum said "these are not real conversations, we are all hiding behind our keyboards", I think he had a point.
Where else is there for audio engineers to hang out with other audio engineers? Leaving here might mean leaving a bunch of people a lot like you, people that think in terms of science and engineering. Not so many to talk to down at the corner pub.

But, you can go there, grab a drink, and still watch wrestling.
  Reply With Quote
Old 18th February 2018, 11:53 PM   #73
TheGimp is offline TheGimp  United States
diyAudio Member
 
TheGimp's Avatar
 
Join Date: Aug 2009
Location: Johnson City, TN
I was hoping I could see the difference between Mylar, PP film and PIO capacitors.

Unfortunately my setup does not reveal any difference between them.

As near as I can see, they all appear the same as the Vitamin Q.
__________________
If there are no dogs in Heaven, I don't want to go there.
  Reply With Quote
Old 18th February 2018, 11:53 PM   #74
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
I know people have left, and I don't know what to say about that other than it's sad, and, to my mind, a bit unnecessary. In my experience, things pass, but again, this is not real like that, these posts (generally) remain, but, so what? Perhaps if you have a reputation to maintain it's important, I'm lucky in that way

Last edited by scottjoplin; 18th February 2018 at 11:56 PM.
  Reply With Quote
Old 18th February 2018, 11:56 PM   #75
RNMarsh is offline RNMarsh  United States
diyAudio Member
 
RNMarsh's Avatar
 
Join Date: May 2012
Location: 2457 Cascade Trail; Cool, CA. 95614
Quote:
Originally Posted by TheGimp View Post
I was hoping I could see the difference between Mylar, PP film and PIO capacitors.

Unfortunately my setup does not reveal any difference between them.

As near as I can see, they all appear the same as the Vitamin Q.
Start here, first --- Picking Capacitors - Walter G. Jung and Richard Marsh

Then to direct-coupled topologies and then to dc servo.

Then to CFA's. :-)


THx-RNMarsh

Last edited by RNMarsh; 19th February 2018 at 12:01 AM.
  Reply With Quote
Old 19th February 2018, 12:02 AM   #76
scott wurcer is online now scott wurcer  United States
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: Belmont MA
Quote:
Originally Posted by Markw4 View Post

Say, I understand at one time there used to be some industry luminaries around here (besides Scott), but some left because they didn't like the way people sometimes carry on.
We could use some more tag team action here, I'm tired of it and I'm thinking of just doing the Ed thing and posting some carefully taken data "just for fun" of how to use 25 cent non-polar electrolytics as input coupling caps. BTW SY's data is just fine unless you want to call him a liar the $400 Teflon cap and the back to back 25 cent electrolytics are identical with just slight care in selecting the high pass frequency.

Here comes 'da Crusher

YouTube
__________________
"The way up and the way down are one in the same"
  Reply With Quote
Old 19th February 2018, 12:03 AM   #77
scott wurcer is online now scott wurcer  United States
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: Belmont MA
Quote:
Originally Posted by TheGimp View Post
I was hoping I could see the difference between Mylar, PP film and PIO capacitors.
Trust yourself.
__________________
"The way up and the way down are one in the same"
  Reply With Quote
Old 19th February 2018, 12:05 AM   #78
TheGimp is offline TheGimp  United States
diyAudio Member
 
TheGimp's Avatar
 
Join Date: Aug 2009
Location: Johnson City, TN
Thanks, I have read that previously, but will go back and read it again.
__________________
If there are no dogs in Heaven, I don't want to go there.
  Reply With Quote
Old 19th February 2018, 12:06 AM   #79
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Quote:
Originally Posted by scott wurcer View Post
SY's data is just fine
I expect it is. It was the tone that I was talking about. The one other one-line comment was not actually meant to be about the quality of Sy's work.

Regarding conflicting claims by different people, they must either be looking at different parts, or measuring differently. Obviously. Don't know why we can't just make some progress getting to the bottom of it. Can't see any other way to get past it and move on.

Last edited by Markw4; 19th February 2018 at 12:14 AM.
  Reply With Quote
Old 19th February 2018, 12:07 AM   #80
TheGimp is offline TheGimp  United States
diyAudio Member
 
TheGimp's Avatar
 
Join Date: Aug 2009
Location: Johnson City, TN
I'll watch your crusher and raise you one Gorgeous George:

YouTube
__________________
If there are no dogs in Heaven, I don't want to go there.
  Reply With Quote

Reply


John Curl's Blowtorch preamplifier part IIIHide 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 12:46 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki