Unbalanced to Balanced

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I'm looking for an inexpensive way to convert an unbalanced (consumer audio) signal to a balanced one for input into my car's head unit (there is no aux. in, I'm hijacking the CD changer cable). I've seen several commercial units, but they were all very expensive. If a simple circuit diagram is floating around that would do the job, well then that's what I'm interested in.

Cheers,
Matt
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.