Audio DAC as signal generator (Need DC output). - Page 3 - 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 6th December 2002, 03:43 PM   #21
diyAudio Member
 
Pjotr's Avatar
 
Join Date: Nov 2002
Location: Netherlands
Hi Phil,

Whatever you chose, to get a S/N better than 120 dB will be very difficult. Also noise entering your cabling is very difficult to avoid.

As an alternative for a PCI card you can look at the various USB cards.

If you Google at analog+conversion+pci a load of cards come along. But al professional measurement cards ar no better than 16 bit.

Attached the noise performance of the AD part of my audio card at no input for both channels (8 kHz sample rate). You will clearly see 1/f noise. This is something you cannot avoid due to the properties of semiconductors. The PM1704 is not different.

Attached Images
File Type: gif noise.gif (7.8 KB, 96 views)
  Reply With Quote
Old 7th December 2002, 01:05 AM   #22
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
I'm not really certain the exact magnitude of the signal and errors you want to measure and replicate as I've seen 10mV, and 0.045uV quoted in these postings, quite an extreme. At the bottom end even a small movement of the cable (if it's not a really low noise cable) can cause the movement of electrons !

It really sounds like a Keithley Instruments, nanovolt source type problem -- you can spend a couple kilobucks and buy one of their units with a 488 type interface.
  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
Why TAS3103 no audio signal output? KevinChen Digital Source 6 25th February 2011 01:32 PM
Wanted: one audio signal generator sdaudio2 Swap Meet 0 6th May 2007 01:04 PM
FS: BK Precision 3001 Handheld audio signal generator davidhs Swap Meet 3 6th May 2007 06:18 AM
Class Evolution-Modulating SMPS output to track audio signal vectorplane Power Supplies 42 13th January 2007 12:33 PM


New To Site? Need Help?

All times are GMT. The time now is 12:37 AM.


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