TDA8571J even in the car stereo 200w … 300w sold as cheap car amplifiers used in advanced integrated amplifier operating voltage of 6 volts DC …. 18volt dc circuit is established with very few passive components. TDA8571J 4×40 W... Electronics Projects, 4X40W Car Amplifier Circuit TDA8571J "audio amplifier circuits, ic amplifier, " Date 2014/06/22