equipment that involves the controlled conduction of electrons (especially in a gas or vacuum or semiconductor)

an electronic amplification system used as a communication system in public areas

an electronic receiver that detects and demodulates and amplifies transmitted signals

reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound

increase the volume of

increase in size, volume or significance

an amplifier that increases the amplitude of reproduced sound

an amplifier for restoring the strength of a transmitted signal

an acronym for microwave amplification by stimulated emission of radiation; an amplifier that works on the same principle as a laser and emits coherent microwave radiation

an electronic amplifier that prepares a small electrical signal for further amplification or processing.

an electromagnetic device for amplifying electrical signals.

an electronic amplification system used as a communication system in public areas

an electronic receiver that detects and demodulates and amplifies transmitted signals

reproducer in which two microphones feed two or more loudspeakers to give a three-dimensional effect to the sound