WTA : The best way to take analog signal directly from Laptop - diyAudio
Go Back   Home > Forums > Source & Line > PC Based

PC Based Computer music servers, crossovers, and equalization

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 24th October 2013, 07:58 AM   #1
redsky is offline redsky  Indonesia
diyAudio Member
 
redsky's Avatar
 
Join Date: Apr 2011
Location: Banda Aceh
Question WTA : The best way to take analog signal directly from Laptop

Hi guys

I really curious how to take directly analog signal from PC/Laptop (without DAC).

Does it isolation transformer is the best way to take directly analog audio signal from pc ? it's realy can supply a clean signal ?

Many thanks before
__________________
Small is enough. Clean is good. Simple is easy. Small, Clean and Simple is ZCA. And this is so beautiful....
  Reply With Quote
Old 24th October 2013, 08:38 AM   #2
diyAudio Member
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
As a laptop is isolated from the mains power source (double insulated power supply) and effectively "floating" the headphone output is the most logical way to extract analogue audio with no need for isolation through transformers etc.
__________________
www.flyingmole.co.uk For World Wide support for Flying Mole, Class D, Refurbishment and Repairs. www.jonsnell.co.uk
  Reply With Quote
Old 24th October 2013, 09:26 AM   #3
diyAudio Member
 
Join Date: Apr 2013
Directly plugging into the headphone jack will probably be all that is needed - maybe try the line out jack if there is one. If the noise level seems to be higher than you would expect from listening on headphones you might try a proper audio isolation transformer with an electrostatic screen between primary and secondary. Connect the screen to your external audio gear ground connection. The pc is a hotbed of electronic noise and although it is usually reasonably well confined inside the pc case it can get out via interconnect cables.
  Reply With Quote
Old 24th October 2013, 09:42 AM   #4
DF96 is online now DF96  England
diyAudio Member
 
Join Date: May 2007
What do you mean by a "clean signal"? Laptops may use a Class D amp so the audio might be accompanied by high frequency stuff. Laptop headphone amps are probably not selected for their ultimate audio performance so it all depends what your aim is.
  Reply With Quote
Old 24th October 2013, 11:39 AM   #5
Anatoly is offline Anatoly  Russian Federation
diyAudio Member
 
Join Date: Jan 2008
Even if you use a very high quality transformer, then no unique connection scheme will not help to get even the sound of average quality.
  Reply With Quote
Old 1st November 2013, 02:00 PM   #6
diyAudio Member
 
Join Date: May 2012
Quote:
Originally Posted by Anatoly View Post
Even if you use a very high quality transformer, then no unique connection scheme will not help to get even the sound of average quality.
But it will still isolate you from awful noise from the laptop's PSU. Some laptops are noisy, others are not. I know a couple of audio pro's that use their laptops solely on battery to avoid ground problems.

Personally, I prefer [digital] optical in/out on computers because it isolates from grounding problems.
  Reply With Quote
Old 1st November 2013, 05:08 PM   #7
diyAudio Member
 
Join Date: Jan 2013
Location: Oregon City, Oregon
I've tried a variety of laptops in my main audio system, and while some weren't bad, some really were awful sounding.

The solution was to use a USB DAC. You can get anything from a $20 cheap one to as much as you are able to spend. Even the cheapest one was a vast improvement over what was in my old Toshiba laptop. On a par with my really ancient Compaq (so ancient, I think it has a -486 in it)
  Reply With Quote
Old 1st November 2013, 05:40 PM   #8
diyAudio Member
 
Rundmaus's Avatar
 
Join Date: Aug 2005
Quote:
Originally Posted by jplesset View Post
The solution was to use a USB DAC. You can get anything from a $20 cheap one to as much as you are able to spend.
+1

Laptop sound devices are designed to provide some sort of sound output, with the main design considerations being minimization of cost, space and energy consumption. Apart from design issues, analog circuitry in a Laptop suffers from the physical proximity to digital HF stuff and PC-related noise sources.

The only way to get a decend audio signal out of a mobile PC is to use an external (USB) DAC, I think.

Rundmaus
  Reply With Quote
Old 19th November 2013, 12:44 PM   #9
redsky is offline redsky  Indonesia
diyAudio Member
 
redsky's Avatar
 
Join Date: Apr 2011
Location: Banda Aceh
Hi All...

Many thanks for all respons...
Actually I was got a cheap USB to SPDIF converter (with PCM2704 ) two years ago...
So in my subjective listening.. that sounds too light ( too digitaly i mean ) even is clean....

Now, I try make some passive filter to take sound directly from my laptop. I think the sounds is good. Just try to play with some capacitor and resistor divider. I connect it to Phono line in my TEAC AR-500 Amp.

This is the schematic. You all can try this for a cheap way .

Click the image to open in full size.

Regards...
__________________
Small is enough. Clean is good. Simple is easy. Small, Clean and Simple is ZCA. And this is so beautiful....
  Reply With Quote
Old 19th November 2013, 05:54 PM   #10
redsky is offline redsky  Indonesia
diyAudio Member
 
redsky's Avatar
 
Join Date: Apr 2011
Location: Banda Aceh
Schematic
Attached Images
File Type: jpg Passive Filter for PC.JPG (12.6 KB, 53 views)
__________________
Small is enough. Clean is good. Simple is easy. Small, Clean and Simple is ZCA. And this is so beautiful....
  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
Analog Signal to fire Contact Closure jvamos Analog Line Level 9 29th March 2014 01:19 AM
Should I directly connect my signal ground to chassis ground? Bricolo Solid State 4 18th March 2014 09:42 PM
Quiet amp hums with signal source or input directly tied to star earth?? bigwill Tubes / Valves 51 13th June 2010 04:50 PM
Turning a small AC analog signal into DC HankMcSpank Solid State 8 22nd April 2009 01:39 PM
Does digital data inverted results in analog signal inveted? Tubeee Digital Source 27 7th June 2005 12:34 PM


New To Site? Need Help?

All times are GMT. The time now is 12:00 PM.


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