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For this amplifier circuit using three voltage plus, min, and the ground. with a maximum voltage approximately 55Volt DC. And amplifier circuit can use some ic ie IC STK 030, 058, 075, 077, 078, 080, 082, 083, 084, 086. From all the ic I mentioned all of them can be applied to this amplifier circuit. But every ic whether there might be a different maximum voltage or power output, etc.. For this amplifier suitable for use at home, who need a voice soft and tasty. With a maximum output of 70W 8ohm impedance is my take of the highest IC output is STK086. Part List R1 = 1K R2 = 56K R3 = 100R R4 = 100R R5 = 56K R6 = 4.7R R7 = 2.7K C1 = 1uF C2 = 470pF C3 = 100uF C4 = 100uF C5 = 0.047uF C6 = 47uF C7 = 1800pF C8 = 10uF IC = STK 030, 058, 075, 077, 078, 080, 082, 083, 084, 086.

There are possible alternative input stage transistors, the Toshiba 2SA970BL and 2SC2240BL, which appear to be good substitutes for the Hitachi 2SA1085E and 2SC2547E. The ‘BL’ suffix is the high gain group. Alternatives for the Sanyo 2SC2911 and 2SA1209 are the Toshiba 2SC3423 and 2SA1360. 70W Mosfet power amplifier Circuit Diagram This 70W power amplifier is designed for quality rather than quantity, and if much higher power is really needed there are other more suitable design approaches. This is an awesome amplifier circuit, and this is the older version�(MJR7-Mk3). There is new version released (MJR7-Mk5) for better quality and performance, just go to THIS PAGE for complete circuit explanation. source