amplifier: A amplifier is a device which multiplies a signal by a given or adjustable factor. Most common are amplifiers in electronics.

modifier: A device with the input and output signal belonging to the same signal domain (electrical, chemical, mechanical, optical, thermal, magnetic and radiant).

transducer: A device that transfers or translates energy from one kind of a system to another. F.ex. A transducer can transfer a thermal signal into an electrical signal.

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