The amplifier uses a hybrid two-channel IC STK4241-II manufactured by SANYO. Immediately, it is worth noting that the pinout of the STK4241 is compatible with such chips as the STK4201V-series (THD = 0.08%) and the STK4141-series (THD = 0.02%).... Electronics Projects, STK4241 STK4201 STK4221 STK4211 STK4231 Amplifier Circuit "audio amplifier circuits, ic amplifier, " Date 2019/08/04