Balanced circuit
in which paths are impedance-matched From Wikipedia, the free encyclopedia
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A balanced circuit is a way to connect electronic systems together so that they can exchange electrical signals (like sound) while avoiding interference.
To do this, one uses a cable with two or more wires. The cable is balanced if the impedances of the two wires are the same. This causes the noise to be common-mode (the same on both wires). Since it is easy to remove common-mode noise, a balanced circuit is a good way to keep noise out of electronic systems.[1]
When used to send sound, balanced cables use XLR connectors or phone connectors. Balanced circuits first became common in early 20th century telephone lines.
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