![]() ![]() The core that they are wound on may either be empty (air core) or, equivalently, a magnetically neutral material like a porcelain support, or it may be a material which is good magnetic conductor like ferrite in modern high-frequency (HF) baluns, or soft iron as in the early days of telegraphy. The primary winding receives the input signal, and the secondary winding puts out the converted signal. This type is sometimes called a voltage balun. The advantage of transformer-type over other types of balun is that the electrically separate windings for input and output allow these baluns to connect circuits whose ground-level voltages are subject to ground loops or are otherwise electrically incompatible for that reason they are often called isolation transformers. In classical transformers, there are two electrically separate windings of wire coils around the transformer's core. ![]()
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