"A standard CD player outputs signal at 24V" - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

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 9th July 2009, 11:52 PM   #1
wwenze is offline wwenze  Singapore
diyAudio Member
 
Join Date: Mar 2008
Default "A standard CD player outputs signal at 24V"

Quote:
Most portable devices are powered by USB and their power supply is limited to 5V. This means the output of the signal is limited to the maximum of 5V. On the other hand, a full scale component like a CD / DVD player has no such constraint, a standard CD player will happily output signal at 24V (+/-12V DC)

A standard amplifier that is designed to accept the standard 24V line input is going to struggle to deal with the 5V input. The end result is a 100W rated power amplifier struggling to produce 23W. That is why it does not sound right!
http://www.bursonaudio.com/burson_buffer_160.htm

O.o

I don't know what kind of standard those guys live with.
  Reply With Quote
Old 10th July 2009, 02:30 AM   #2
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie



That graph shown with the various output levels is...not right... IME.
PC soundcards generally have a level LOWER than that of an Ipod,cd player,etc.I have yet to run across a 'consumer' soundcard that outputs an actual line-level signal. They have all been about half that.
  Reply With Quote
Old 10th July 2009, 04:32 PM   #3
diyAudio Member
 
Join Date: Oct 2006
Standard CD maximum output level is 2V RMS. Even the peak to peak equivalent voltage of that is less than 6V. Most power amplifiers are designed with a gain set to output maximum wattage with a 0.5V RMS input. "Standard' line level is generally regarded as between 0.5V to 1V RMS. I don't know where the heck they got that 24V rubbish. It can be the max peak to peak voltage output of an active stage/opamp supplied at +/-12VDC, but it absolutely is NOT any kind of standard output level for any cd, sacd or etc.
  Reply With Quote
Old 11th July 2009, 04:38 AM   #4
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
2.4V and 0.5V is about right.
Perhaps their amp has a gain of 10 ?


P.
  Reply With Quote
Old 11th July 2009, 06:08 AM   #5
cbdb is online now cbdb  Canada
diyAudio Member
 
Join Date: Oct 2008
Location: Vancouver
That page is full of rubish, not only is the 24V thing wrong but the impedance matching is a total red herring. It only applies to power transfer, which has nothing to do with transfering a signal from preamp to power amp.

Not to mention the terrible english:

Quote:
In the recent years one of the phenomenal is the raise of PC /Laptop / IPOD base audio system. The easy of use; the scalability of such system and the new loss less compression
Are you sure this isnt a joke?
  Reply With Quote
Old 11th July 2009, 06:24 AM   #6
wwenze is offline wwenze  Singapore
diyAudio Member
 
Join Date: Mar 2008
Strange that they managed to find the output impedance figures of the CDPs to put on their web, yet miss totally the output level figures which is right next to it on the specifications page.

cdbd - "Are you sure this isnt a joke?", well, it is much more scary to know that this company has long been in existence and the Burson op-amp is in fact pretty well-known, and not too long ago someone had started a thread about it: Op-Amps advice
  Reply With Quote
Old 11th July 2009, 07:40 AM   #7
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Default Re: "A standard CD player outputs signal at 24V"

Quote:
Originally posted by wwenze


I don't know what kind of standard those guys live with.

The 1000% + profit margins can skew perception a bit. The important thing is diyers love them.
  Reply With Quote
Old 11th July 2009, 01:58 PM   #8
diyAudio Member
 
Steerpike's Avatar
 
Join Date: Jan 2006
Location: Johannesburg, South Africa
Quote:
powered by USB and their power supply is limited to 5V
They are assembling circuitry and don't yet know about DC-DC converters?
__________________
Steerpike's Toybox
  Reply With Quote
Old 11th July 2009, 02:18 PM   #9
awpagan is offline awpagan  Australia
diyAudio Member
 
Join Date: Nov 2004
Location: sydney
Default burson credability

burson credibility

http://www.diyaudio.com/forums/showt...185&highlight=


I still think these people make them, and Burson re-label them.
http://www.audio-gd.com/En%20audio-gd.htm
__________________
Indecision makes the world gone round.
Maybe
  Reply With Quote
Old 11th July 2009, 03:02 PM   #10
diyAudio Member
 
scott wurcer's Avatar
 
Join Date: Jan 2004
Location: cambridge ma
Default Re: burson credability

Quote:
Originally posted by awpagan
burson credibility




__________________
"This logos holds always but humans always prove unable to understand it, both before hearing it and when they have first heard it."
  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
Using a standard pentode-tetrode as output "space-charge tube" any ideas-experiences? bembel Tubes / Valves 12 11th March 2010 05:56 AM
need list of "standard" values such as impedance keantoken Everything Else 3 30th August 2006 04:40 AM
cheap 6" or 8" woofer to make great bass for a standard cab pick up zuki Subwoofers 12 15th February 2005 07:54 AM
A "Standard Noise Source" for SPL meters. Jonathan Bright Everything Else 6 13th July 2004 10:19 PM
"Standard" EIC power input vs. Filtered EIC Eric Everything Else 16 18th May 2001 09:31 AM


New To Site? Need Help?

All times are GMT. The time now is 03:20 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