In many portable audio applications the required output power does not exceed 1W. The sensitivity and input impedance in this case should be such that the maximum output power is obtained when the input is connected to a ceramic pick-up element or a detector in a portable radio. Other requirements are that the circuit should still operate at half the nominal supply voltage and that the total current drain is low. Furthermore the complete audio circuit should be compact, easy to mount, have a low noise, and a reasonably low distortion factor. To meet these requirements the TAA300 has been specially developed. It contains a silicon chip of only 2 mm2, on which 9 planar npn transistors, ...

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