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Audio Power Amplifiers
Perhaps one of the easiest ways to understand how an analog audio amplifier works is to think of it as a kind of audio valve or switch. These are vacuum tubes or transistors that stores energy from the wall outlet and then releases it in measured amounts to your speaker systems. The amount being discharged is processed to the rapid variations of the incoming audio signal.
In effect, an analog audio power amplifier is comprised of two separate circuits, one of which, the audo amplifier output circuit, generates an entirely new and powerful electrical output signal based on the dj amplifiers incoming audio signal. The incoming signal is an AC signal of perhaps 1 volt that represents the rapidly varying waveforms of sounds. This weak AC signal is used to modulate a circuit that releases power measured in volts and amps. These are stored up by the big capacitors and transformer in the power amplifiers power supply, power that is discharged in a way that exactly parallels the tiny modulations of the incoming audio signal. This signal in the DJ amplifier’s input stage is converted to DC voltage at the secondary side of the transformer, and applies a varying conductivity to the audio amplifiers output circuit’s transistors, which release power from the amplifier’s power supply to move your loudspeaker’s cones and domes.
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