Chapter 7
Audio amplifiers
This chapter will look at how semiconductor components can be used to amplify signals, beginning with a brief discussion on how to calculate power, voltage and loudness decibel levels and why the relationship between them is important for audio systems. The next topic considers how a charge barrier restricts the flow of charge in a diode to a single direction, which allows it to be used for full wave rectification to convert an AC power signal (from mains supply) to a DC signal for use in an electronic circuit. This principle of the charge barrier can then be used to amplify an input signal within a transistor, where a small current at the base of the transistor will allow a much larger current to flow through the ...
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