This is the circuit diagram of stereo power amplifier which use STK4241V as the main component. The amplifier will give you audio power output up to 120W on each channel if you use optimum power supply.
STK4241V features:
- Muting circuit built-in to isolate all types of shock noise
- Current mirror circuit for low 0.08% total harmonic distortion
Components list:
R1, R24 = 1K / 0.125W
R2, R5, R21, R23 = 56K / 0.125W
R6, R22 = 560 ohm / 0.125W
R7, R18 = 4.7K / 0.25W
R8, R19 = 4.7K / 0.5K
R9, R10 = 1K / 0.5W
C1, C19 = 2.2uF/50V
C2, C20 = 470pF ceramic 50V
C4, C10, C13 = 10uF/63V
C5, C15 = 1uF/63V
C6, C16 = 1nF/100V
C7, C17 = 3pF ceramic
C8, C18 = 100uF/16V
C9, C14 = 47uF/63V
C11, C12 = 100nF/100V
PCB layout design for 120W stereo power audio amplifier:
STK4241V power IC:
The circuit need split power supply to work. Here the power supply circuit for 120W stereo power amplifier:
The maximum supply voltage is ±70V with recommended supply ±54. Then minimum of 5A transformer should be used for the power supply.
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