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So basically, It works a bit like a preamp/amp on an audio system?
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Sort of, yes. With any amplifier, you must have an appropriate input signal in order for the amplifier to be able to work with it and amplify it. The pre-amp to an audio system is another example of this, yes. Some car stereo receivers will boast of having a certain amount of pre-amp output wattage. Most of this falls by the way-side as people don't know what to make of it, and they just connect receivers to amplifiers without paying any mind to that. The result of coupling a stereo, with no pre-amp, to an amplifier that needs an apropriate level of pre-amping, would be distortion and noise. With a power amplifier, such as an H-bridge, it ends up to be loss of power.