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A: By using PWM or magnetic amplifiers

Q: How can you step up or down voltage in dc system?

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A: By using PWM or magnetic amplifiers

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as a material, nothing
as a device to perform the function, vacuum tubes or magnetic amplifiers

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Second generation computers used electronic transistors. A small number used magnetic amplifiers.

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The most used instrument amplifiers are also some of the most popular amplifiers namely Marshall, Crate and Fox amplifiers. The impedance of these amplifiers does not need to match making it perfect for instrument use.

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Two brands of home stereo amplifiers include McIntosh and Yamaha amplifiers. Other brands that also include home amplifiers are Atlona, Russound, Onkyo, Bose, and Pyle amplifiers.

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