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Toroidal inductors and transformers are inductors and transformers which use magnetic cores with a toroidal (ring or donut) shape. They are passive electronic components , consisting of a circular ring or donut shaped magnetic core of ferromagnetic material such as laminated iron , iron powder, or ferrite , around which wire is wound.
The power supply toroidal transformer is on right Five audio transformers for various line level purposes. The two black boxes on the left contain 1:1 transformers for splitting signals, balancing unbalanced signals , or isolating two different AC ground systems to eliminate buzz and hum.
The Williamson transformers had to be heavier, larger, more complex and more expensive than typical audio transformers, and yet they could only guarantee minimally acceptable stability. [ 2 ] [ 69 ] A wider phase margin, wrote Williamson, was highly desirable but required absolutely impractical values of primary inductance.
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In telecommunications, a repeating coil is a voice-frequency transformer characterized by a closed magnetic core, a pair of identical balanced primary windings, a pair of identical but not necessarily balanced secondary (drop) windings, and low transmission loss at voice frequencies.
The two interlocking rings are the primary and secondary transformer windings. The spherical objects directly below and to the right of the windings are a spark ball gap, for lightning protection. An Austin ring transformer is a special type of isolation transformer with low capacitance between the primary and secondary windings and high isolation.
Cores can also be classified by shape, such as toroidal, shell, or cylindrical cores. The ferrite cores used for power transformers work in the low-frequency range (1 to 200 kHz usually [ 2 ] ) and are relatively large in size, can be toroidal, shell, or shaped like the letters 'C', 'D', or 'E'.
Bifilar wound toroidal transformer, also known as a common-mode choke. A different type of bifilar coil is used in some relay windings and transformers used for a switched-mode power supply to suppress back-emf. In this case, the two wire coils are closely spaced and wound in parallel but are electrically isolated from each other.