The TDA1600 is a bipolar circuit designed for high-fidelity cassette recorders. This device contains several functions which can be selected by external d.c. voltage levels or via a microprocessor. The TDA1600 operates from a main-fed asymmetrical power supply. For application purposes, the voltage output can be either 1/2Vp asymmetrical or 1/2Vp symmetrical. The output of all the functions is current protected.