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/iframe></center><br><br> <br><br> </center> </td></tr> </table> <center> <table> <tr> <td width="600"> <center><hr width="400"><font size="2"><b>The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Usenet Archive Feeds Directly<br>From The Open And Publicly Available Newsgroup<br>Sci.Electronics.Design<br><br>This Group And Thousands Of Others Are Available<br>On Most IS NNTP News Servers On Port 119.<br><br><a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a> Is NOT Responsible For Any Topic,<br>Opinions Or Content Posted To This Or Any Other<br>Newsgroup. This Web Archive Of The Newsgroup And<br>Posts Are For Informational Purposes Only.<br><br></b></font><hr width="400"></center> <center><font size="2"><pre><b> From: "news.cable.ntlworld.com" <gavin.sharp@ntlworld.com> Newsgroups: sci.electronics.design References: <Vtcu9.1033$GK4.100159@newsfep1-win.server.ntli.net> <3200347.0210251320.738f5ebc@posting.google.com> Subject: Re: Output Impedence X-Newsreader: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Inktomi-Trace: pc1-bigg1-2-cust64.lutn.cable.ntl.com 1035749783 25592 213.107.35.64 (27 Oct 2002 20:16:23 GMT) Message-ID: <NQXu9.1848$m55.91411@newsfep1-gui.server.ntli.net> Date: Sat, 26 Oct 2002 16:41:14 +0100 NNTP-Posting-Host: 80.1.224.4 NNTP-Posting-Date: Sun, 27 Oct 2002 20:16:45 GMT Organization: ntl News Service Cheers Guys, The reason I want to know is because I have a soundcard that is conectted to a mixing desk via a line out. However, there is really bad hum on the line (about -36db) which is noticably audiable. I have checked the desk, computer, soundcard and cables and have come to the conclusion that is a earth loop problem. I am going to put an isolation TX 1:1 on the soundcard output but all the specs I have seen on different TX's state input/output impedences. Thats why I need to know. Thats unless it doesn't really matter ?? Thanks, Gavin. "Tom Bruhns" <k7itm@aol.com> wrote in message news:3200347.0210251320.738f5ebc@posting.google.com... > "news.cable.ntlworld.com" <gavin.sharp@ntlworld.com> wrote in message news:<Vtcu9.1033$GK4.100159@newsfep1-win.server.ntli.net>... > > Hi, > > > > How would I go about getting the output impedence of a computer sound card. > > Look up the specs for the card, or measure it. Unfortunately, the > term "output impedance" is tossed about rather freely. Technically, > it should mean the source impedance you see looking back into that > output, but often people use the same term to mean "recommended load > impedance." For example, the output impedance of a typical stereo > amplifier is a fraction of an ohm, but the recommended range of load > impedances might be "greater than 4 ohms" or "greater than 6 ohms" or > whatever. That's determined by how much heat may safely be dissipated > in the amplifier, and what distortion level can be tolerated, and a > few other such things. > > It should be safe to put a standard headphone load on a headphone > output, or an 8 ohm speaker load on a speaker output, or a typical > line load on a line output. If you really must measure the output > (source) impedance, output a constant level, and put a reasonable load > on the output and note how much the output voltage drops. If the > source impedance and load are both resistive, then Vl/Vo = Rl/(Ro+Rl), > where Vl is the loaded output voltage, Vo is the open-circuit output > voltage, Rl is the load resistance, and Ro is the output source > resistance. So, for instance, if you don't see any significant drop > in voltage when you put the load on, Ro is much smaller than Rl. If > the voltage drops to half, Rl=Ro. It's likely to be somewhat > frequency dependent. > > Cheers, > Tom </b></pre></font><hr width="650"><a href="http://www.cyber-spy.com/electo-index.html"><font size="3">Go Back To The <a href="http://www.cyber-spy.com/">Cyber-Spy.Com</a><br>Usenet Web Archive Index Of<br>The sci.electronics.design Newsgroup</font></a><br><br></center></td><img src="http://cyber-spy.com/cgi-bin/livecntr.pl?0+1+unetsci" width="1" height="1" alt="The Cyber-Spy Toolkit - powerful internet spy software - live police scanners - usenet fbi secrets archive - newsgroup spy electronics archive - search engine spy tools - download TCST today!"> </tr> </table> </center> <center> <br><center><hr size="3"></center> <table width="100%" cellpadding="0" border="0" cellspacing="0"> <tr> <td align="left" valign="top"><small><b><i><a href="http://www.cyber-spy.com/index.html">Cyber-Spy.Com Live Resources</a></i></b></small></td> <td align="right" valign="top"><small> Copyright Alpha Omega Delta,<br> All rights reserved. </small></td> </tr> </table> <center><hr size="3"></center> <br><br> <br><br></center> </body></html>