Power Amplifier APEX B250, power amplifier circuit using transistor for based amplify audio. This power amplifier circuit using Transistor MJE350 , MJE340, MJE15032 , MJE15033 , 2SA1943 , 2SC5200. For the best quality audio output power amplifier , use the quality component's. This power amp can using power supply from 45V - 90V with current 10A. Buffer power amplifier using IC NE5532 for processing audio input signal and produced again with transistor driver and booster.