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Amplifier - Simple English Wikipedia, the free encyclopedia
https://simple.wikipedia.org/wiki/Amplifier
The word amplifier (sometimes called an amp) usually refers to an electronic amplifier.Electronic amplifiers make a signal from a radio or electric musical instrument (such as an electric guitar or an electric bass guitar) louder and stronger.Amplifiers are also hidden in any electronic thing that makes sound with loudspeakers. This includes televisions, radios, computers, and mp3 …
Speaker (audio equipment) - Wikipedia
https://en.wikipedia.org/wiki/Speaker_(audio_equipment)
Among audio equipment, a speaker (also sometimes called a speaker driver or, especially if audible at a distance, a loudspeaker) is an electroacoustic transducer, that is, a device that converts an electrical audio signal into a corresponding sound. A speaker system, also often simply referred to as a "speaker" or "loudspeaker", comprises one or more such speaker drivers …
Audio Amplifier Circuit
https://web.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Lab%201a%20-%202C%202007.pdf
right? Why not just use a simple op-amp gain stage? Well, one immediate challenge is that speakers have a low impedance, typically 8-Ohm. Even for a low-power 0.5W audio amplifier, PIR 2 /2 requires that the amplifier must be able to source a peak AC current of around 350 mA with an 8-Ohm load. This is a lot more than a typical op-amp is ...
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