What is a disadvantage of transformer coupling?

Transformer coupling has a few disadvantages, one of which is related to its size and cost. When transformers are used for coupling in circuits, they tend to be relatively large, especially when significant power handling or low-frequency applications are involved. The physical size of the transformer is largely due to the need for an appropriate core to efficiently transfer energy between its windings. Additionally, transformers can be costly to manufacture, particularly if designed for high-performance applications. These factors contribute to transformer coupling being less ideal in situations where space and budget constraints are critical considerations.

While other factors like impedance matching and frequency response may present challenges in certain scenarios, the primary noted disadvantage here revolves around the bulkiness and expense associated with using transformers in coupling applications. Understanding these nuances helps in making informed choices regarding circuit design and component selection.