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
- v
- t
- e
- Balun
- Buchholz relay
- Bushing
- Center tap
- Circle diagram
- Condition monitoring of transformers
- Electrical insulation paper
- Growler
- High-leg delta
- Induction regulator
- Leakage inductance
- Magnet wire
- Metadyne
- Open-circuit test
- Polarity
- Pressure relief valve
- Quadrature booster
- Resolver
- Resonant inductive coupling
- Severity factor
- Short-circuit test
- Stacking factor
- Synchro
- Tap changer
- Toroidal inductors and transformers
- Transformer oil
- Transformer utilization factor
- Vector group
- Autotransformer
- Buck–boost transformer
- Distribution transformer
- Delta-wye transformer
- Energy efficient transformer
- Flyback transformer
- Grounding transformer
- Instrument transformer
- Isolation transformer
- Linear variable differential transformer
- Parametric transformer
- Planar transformer
- Rotary transformer
- Rotary variable differential transformer
- Scott-T transformer
- Solid-state transformer
- Trigger transformer
- Variable-frequency transformer
- Zigzag transformer
- Hybrid coil
- Induction coil
- Oudin coil
- Polyphase coil
- Repeating coil
- Tesla coil
- Trembler coil
Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).