A 4 channel passive video balun is defined as a specialized electrical transformer that converts electrical signals that are balance about ground (differential) to signals that are unbalanced (or single-ended) and or converts signals that are unbalanced to balanced. In that manner they are used as devices that are used to connect lines of different impedance. Balun is derived from two separate words; BALance and UNbalance (BAL+UN).
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May