Repeating coil

In telecommunications, a repeating coil is a voice-frequency transformer characterized by a closed magnetic core, a pair of identical balanced primary (line) windings, a pair of identical but not necessarily balanced secondary (drop) windings, and low transmission loss at voice frequencies. It permits transfer of voice currents from one winding to another by magnetic induction, matches line and drop impedances, and prevents direct conduction between the line and the drop.

It is a special application of an isolation transformer, and is often used to prevent ground loops or earth loops, which cause humming or buzzing in audio circuits. It also prevents low direct current voltages from passing.

References

Transformer
Types	Amorphous metal transformer Austin transformer Autotransformer Buck–boost transformer Capacitor voltage transformer Current transformer Distribution transformer Delta-wye transformer Energy efficient transformer Flyback transformer Grounding transformer Instrument transformer Isolation transformer Dry isolation transformer Linear variable differential transformer Modulation transformer Neon-sign transformer Padmount transformer Paraformer Planar transformers Rotary transformer Rotary variable differential transformer Scott-T transformer Solid-state transformer Trigger transformer Variable-frequency transformer Zigzag transformer
Coils	Hybrid coil Induction coil Oudin coil Polyphase coil Repeating coil Tesla coil Trembler coil
Topics	Agbioeletric Balun Buchholz relay Bushing Center tap Circle diagram Condition monitoring of transformers Copper loss Dissolved gas analysis Electrical insulation paper Growler High-leg delta Induction regulator Leakage inductance Magnet wire Metadyne Open-circuit test Polarity Polychlorinated biphenyl Quadrature booster Resolver Resonant inductive coupling Severity factor Short-circuit test Stacking factor Synchro Tap changer Toroidal inductors and transformers Transformer oil Transformer oil testing Transformer utilization factor Vector group
Manufacturers	ABB Prolec GE Siemens TBEA

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This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).

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