Výkonové zesilovače pro elektroakustické aplikace

Abstract

The amplifiers are used everywhere in audio technology. The aim is to amplify signal in required label and appropriate quality. The dissertation is focused on Low-Frequency amplifiers, especially their parameters for electro –acoustic applications. Theoretical introduction contains description of basic parameters and their comparison under particular working classes for amplifiers. The Czech and English names and abbreviations for quality parameters, used in technical texts, are included. The practical part of work contains the concrete project and solution of chosen power amplifier, which is assembled from three components: output stage, emitter follower and pre-amplifier. Selected connection of amplifier in working class “A” is completed with thermal compensation. So that the transistors ThermalTrak, integrated with measuring diode are installed. Using this solution the temperature is catching very quickly. The amplifier is completed with pre-amplifier, which is exposing inlet impedance and sensitivity for output stage. The final realization is assembled in two circuit boards.