Power Amplifiers Audio Circuits

Class D amplifiers are much more efficient than other Classical amplifiers, but their high efficiency comes at the expense of increased noise and distortion. You can assess the frequency- and Time-domain characteristics of a Class D amplifier, including the output filter, using online simulations. Class T Digital Audio Amplifier Evaluation Board
Power Amplifiers Audio Circuits - schematic

This application note describes a digital amplifier, which operates from13. 5-Volt power source and outputs up to20W poor channel power. The application note is in PDF format. Uses a Digital Power Processing Technology EB TA2020 from Tripath Technology. Subwoofer Equalizer : The Linkwitz transform circuit is a hugely flexible way to equalize the bottom end of a sealed loudspeaker enclosure. A speaker that is corrected using this method is flat from below resonance to the upper limit of the selected driver. The low frequency roll off point is determined by the parameters of the transform circuit. Should the enclosure size be too small and cause a lump in the response before roll off, this is also corrected. A conventional active crossover network is then used to divide the subwoofer signal from the main channel signals. Note that there is also a separate spreadsheet calculator available for calculating component values for different situations not handled by the original circuit.

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