2_W_STEREO_AMPLIFIER

Published:2009/7/12 23:42:00 Author:May | From:SeekIC

The amplifier is built around a ULN2274B dual audio power amplifier and provides a maxintum of 2 W of quality sound. Because the amplifier is composed of two identical subcircuits, only one subcircuit will be covered. Resistor R5 sets the tone and it can be replaced with a variable unit; lower values of that resistor produce more bass. The bias is set by R6 and C4, and R7, R9, and C5 are feedback elements. For a more realistic sound, R8 and C3 are used to roll off the high frequencies. Capacitor C6 is a dc-blocking capacitor. The circuit chip requires from 6 to 26 Vdc without distortion.



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