Quality hi-fi quality 5.1-transistor preamplifier circuit design have given all the details of a list of materials, box dimensions, PCDs, drawings, sound dB details, measurements, notes etc.. BF245C circuit, 2N3019 (2N1711 can be used instead) transistors based on a... Electronics Projects, 5+1 Home Theater System SADC Preamplifier Circuit "audio control circuits, " Date 2019/08/02