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Stereo amplifier
A typical electronic 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 players, to name a few.

Amplifiers ability to use low impedance speakers may vary. Typical impedance is 8 ohms. view more...

Op Amp Circuits: Analog Computers from operational amplifiers

Op Amp Circuits: Analog Computers from operational amplifiers
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