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Old 14th March 2004, 11:11 PM   #1
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Default balanced connections

hi,
i hope this is the right forum for this question. anyhow, i was hoping someone could explain to me what exactly (besides the connector of course) makes a balanced connection a balanced connection.
this is something i have never given much thought to, but now- in the process of building an amp and also a preamp in the works- i have begun to wonder what per se it is, and what its advantages are. thanks.
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Old 14th March 2004, 11:21 PM   #2
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Balanced or differential transmission sends a signal and the inverse of the signal. The difference between the two is amplified at the receiving end. In a single-ended transmission, the difference between the positive signal and the local ground is amplified. One advantage of differential signalling is noise rejection. Noise added to the signal will be added to both the inverted and non-inverted signal, and is known as common-mode noise. This noise can be rejected at the receiving end, in a process known as common-mode rejection. The common-mode rejection ratio or CMRR is a common specification of differential amplification.

You can read much more about this subject in Horowitz & Hill.
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