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
Closed Thread
 
Thread Tools Search this Thread
Old 14th February 2018, 07:10 PM   #99821
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Quote:
Originally Posted by spaceistheplace View Post
Could I ask you to link to these discussions and/or mention these commercial cap options?
Right. A problem is that its easier to google for capacitor info and get hits on articles on why capacitors are bad and shouldn't used, than it is to find a list of qualified good capacitors.
 
Old 14th February 2018, 08:38 PM   #99822
scott wurcer is online now scott wurcer  United States
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: dorchester ma
Quote:
Originally Posted by simon7000 View Post
Don't think so.
You are welcome to your opinions.

Quote:
will create the most IM distortion due to the exponential charging current deviation from a straight line.
Without a non-linear (the usual engineering definition please) component there is no IM either, anything else violates super-position. You can not create any new frequencies by "distorting" just the magnitude/phase relationship of the signals.
__________________
"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."
 
Old 14th February 2018, 08:52 PM   #99823
scott wurcer is online now scott wurcer  United States
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: dorchester ma
Quote:
Originally Posted by spaceistheplace View Post
Could I ask you to link to these discussions and/or mention these commercial cap options?

Not that Iíve done testing, but Iíve happy with the Vishay/Roederstein MKP1839, Wilma FKP and surplus military polystyrenes and micas to fill in the gaps. That covers most of the bases usually.
You can PM Samuel Groner and if he does not have his test results already posted somewhere he will gladly send them.

We build demo cards for cell phone companies all the time using 0805 SMT resistors right out of the bin at CD line level and get -120dB numbers (we have AP's too). I don't know what Ed's problem is.
__________________
"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."
 
Old 14th February 2018, 08:52 PM   #99824
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Quote:
Originally Posted by scott wurcer View Post
Without a non-linear (the usual engineering definition please) component there is no IM either, anything else violates super-position. You can not create any new frequencies by "distorting" just the magnitude/phase relationship of the signals.
True.

Simon7000: I wonder if you have any EE friends you could trust to talk through some of this stuff to your satisfaction in private where there can be some back and forth conversation not all on public display?

Right now you are not winning the argument so much making public statements perhaps not to you best interests.

On the other hand, Scott may not be cut out to be a teacher in some of these cases because he doesn't always pick up on what people don't understand to the extent of explaining in a way that is always clear. Once something has been well learned it can seem quite obvious. Explanations that seem obvious to Scott may sometimes seem as though intentionally obfuscated to those who haven't digested it all yet.
 
Old 14th February 2018, 08:54 PM   #99825
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:
Could I ask you to link to these discussions and/or mention these commercial cap options?
Try search for Bruce Hofer slides of "Designing for Ultra-Low Distortion and Noise in Analog Circuits"

Oops, this is for sine waves, may be not necessary for audio.
 
Old 14th February 2018, 09:04 PM   #99826
rayma is offline rayma  United States
diyAudio Member
 
Join Date: Apr 2011
Quote:
Originally Posted by scott wurcer View Post
You can not create any new frequencies by "distorting" just the magnitude/phase relationship of the signals.
Yes, as long as the circuit has reached a steady state, and its natural response has died out.
For example, a simple (no feedback) RLC circuit can ring for a time at a frequency different
from the input (due to its own time constants), before the input forces the steady state frequency.

Last edited by rayma; 14th February 2018 at 09:15 PM.
 
Old 14th February 2018, 09:12 PM   #99827
Tournesol is offline Tournesol  Belgium
diyAudio Member
 
Tournesol's Avatar
 
Join Date: Sep 2017
Location: Ch‚teau de Moulinsart
Quote:
Originally Posted by dimitri View Post
Oops, this is for sine waves, may be not necessary for audio.
:-)
__________________
Yours faithfully,
Tryphon Tournesol
 
Old 14th February 2018, 09:15 PM   #99828
simon7000 is offline simon7000  United States
diyAudio Member
 
Join Date: Nov 2008
Location: Oakmont PA
Quote:
Originally Posted by Markw4 View Post
True.

Simon7000: I wonder if you have any EE friends you could trust to talk through some of this stuff to your satisfaction in private where there can be some back and forth conversation not all on public display?

Right now you are not winning the argument so much making public statements perhaps not to you best interests.

On the other hand, Scott may not be cut out to be a teacher in some of these cases because he doesn't always pick up on what people don't understand to the extent of explaining in a way that is always clear. Once something has been well learned it can seem quite obvious. Explanations that seem obvious to Scott may sometimes seem as though intentionally obfuscated to those who haven't digested it all yet.
Lots. The problem is that Scott and others here don't have a Álue as to which signal changes are perceptible. He also regularly misunderstands what is said and posted.

Did you look at the result of passing a square wave through a single pole high pass filter? All the same sine waves just a bit of phase shift and the signal no longer sounds the same. Easily demonstrated. Not unkown or even new information.

This started as Scott believing the DA does not affect the perceived sound. It does for many reasons. Now he has moved to perfect capacitors have no effect. They do.

The real issue is which measurements correspond to perception.

Last edited by simon7000; 14th February 2018 at 09:19 PM.
 
Old 14th February 2018, 09:17 PM   #99829
Markw4 is offline Markw4  United States
diyAudio Member
 
Join Date: Jul 2016
Location: California
Quote:
Originally Posted by rayma View Post
Yes, as long as the circuit has reached a steady state, and its natural response has died out.
For example, a circuit can ring (for a time) at a frequency different from the input.
Actually, a linear circuit won't ring at a frequency that is not present in the input signal. For a common example, a step function such as turning on a switch is allowed in linear systems. It contains all frequencies so it can cause ringing at some frequency that may decay away after the transient has passed.
 
Old 14th February 2018, 09:21 PM   #99830
scott wurcer is online now scott wurcer  United States
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: dorchester ma
Quote:
Originally Posted by rayma View Post
Yes, as long as the circuit has reached a steady state, and its natural response has died out.
For example, a simple (no feedback) RLC circuit can ring for a time at a frequency different
from the input (due to its own time constants), before the input forces the steady state frequency.
This is not the sense of my comment. The circuit won't ring unless excited by that frequency in the first place it is not "new" in the strictest sense. NTSC relied on pulsing a crystal once per line with a burst of 3.58MHz and it rung for the rest of the line relying on some fairly good phase/frequency stability.
__________________
"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."
 

Closed Thread


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 10:36 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki