Attenuator (electronics)
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An attenuator is a passive broadband electronic device that reduces the power of a signal without appreciably distorting its waveform.
A 30 dB 5W RF attenuator, DC–18GHz, with N-type coaxial connectors
100 Watt power attenuator
Impedance matching
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In electrical engineering, impedance matching is the practice of designing or adjusting the input impedance or output impedance of an electrical device for a desired value. Often, the desired value is
The middle ear matches mechanical impedance, like a lever.