Chapter 14

Line Outputs

Unbalanced Outputs

There are only two electrical output terminals for an unbalanced output—signal and ground. However, the unbalanced output stage in Figure 14.1a is fitted with a three-pin XLR connector to emphasise that it is always possible to connect the cold wire in a balanced cable to the ground at the output end and still get all the benefits of common-mode rejection if you have a balanced input. If a two-terminal connector is fitted, the link between the cold wire and ground has to be made inside the connector.

The output amplifier in Figure 14.1a is configured as a unity-gain buffer, though in some cases it will be connected as a series-feedback amplifier to give gain. A non-polarised DC-blocking capacitor C1 ...

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