Audio baluns for sound card input?
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Posted by Joerg on March 26, 2005, 1:12 am
Please log in for more thread options Hello Folks, When someone at our church tried to record audio into a laptop this caused a serious racket if line powered. Probably this is due to the laptop switch mode power supply. Only running the laptop off its battery produces a decent recording. Is there a simple balun transformer that you could recommend? I know the Muxlab (Montreal) versions which have great frequency response. However, these are rather bulky devices that are ok for a fixed installation. But this one needs to be small and portable even if it's not 100% "hifi". Ok, of course I could make one. But if there is a smaller of-the-shelf version that would be better. Regards, Joerg http://www.analogconsultants.com | ||||
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Posted by j.b. miller on March 25, 2005, 9:05 pm
Please log in for more thread options How about using the common 'telephone 600r-600r' type transformers ? Easy to find,just hack any old PC modem card.or if you have access to an old Amtelco concentrator, they have great audio transformers in there! jay | ||||
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Posted by Jim Gregory on March 26, 2005, 2:12 am
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Usually, if tiny, the modem xformers have the mid-band freq response of a telco line (200Hz to 4kHz); that's all they ever need to isolat! | ||||
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Posted by Joerg on March 26, 2005, 2:41 am
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Hello Jay, As Jim hinted these are for telephone line bandwidths. I tried them before and while some modem xfmrs do exceed 4kHz substantially they did roll off below 300Hz. Regards, Joerg http://www.analogconsultants.com | ||||
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Posted by Nico Coesel on March 26, 2005, 2:47 pm
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It depends on the quality of the transformer. Where I used to work we used a particular type/brand of these telephone transformers for everything including hifi (roll-off above 20kHz). Also beware not to saturate a transformer. -- Reply to nico@nctdevpuntnl (punt=.) Bedrijven en winkels vindt U op www.adresboekje.nl | ||||
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>find,just hack any old PC modem card.or if you have access to an old Amtelco
>concentrator, they have great audio transformers in there!
>jay