Power supply
Power supply All active audio products require a power supply, the section that provides a suitable voltage and current for the operation of the device. This typically consists of a transformer, rectifier (to turn AC into DC) and regulator (to smooth out fluctuations in the voltage). Power amplifiers in particular are heavily dependent upon the quality of their power supplies, which contribute a significant proportion of their cost and weight. Of the transformer regulated supply designs, the Never Connected power supply is perhaps the best design available, offering a high degree of isolation from the ‘dirty’ mains. Switch mode power supplies are used in some audio applications but they tend to inject noise into the signal path and are not favoured by most audio product designers.
Source: http://www.astintrew.co.uk/support/The%20Astin%20Trew%20Dictionary%20of%20Hi-Fi%20Terms%202008.pdf
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