18
CHAPTER
Transformers and Impedance Matching
WE CAN USE A TRANSFORMER TO OBTAIN THE OPTIMUM VOLTAGE FOR A CIRCUIT, DEVICE, OR SYSTEM. Transformers have various uses in electricity and electronics. For example, they can:
• Match the impedances between a circuit and a load
• Match the impedances between two different circuits or devices
• Provide DC isolation between circuits or devices while letting AC pass
• Make balanced and unbalanced circuits, feed systems, and loads compatible
Principle of the Transformer
When we place two wires near and parallel to each other and then drive a fluctuating current through one of them, a fluctuating current appears in the other, even though no direct physical connection exists between them. We call ...
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