OCL quasi-complementary power amplifier circuit driven by op amp NE5532

The audio power amplifier circuit uses an operational amplifier to form a driver stage, and transistors VT1 to VT4 form a composite complementary symmetrical circuit to serve as power amplification. The total gain of the circuit Au=(R1+R3)/R1, RL is the speaker. The operation of AC signals is similar to that of a simple complementary symmetrical power amplifier.

Among them, the potentiometer RP1 adjusts the gain of the whole machine, and RP2 is used to adjust the midpoint voltage. This circuit can be successfully debugged after simple debugging. If you replace different op amps , the tone of the whole machine will change accordingly. The fun of DIY is all in it. The disadvantage is that the power is small. The power supply of the op amp can be increased and stabilized at plus or minus 15V, and the voltage of the subsequent power amplifier tube can be increased to more than plus or minus 30V, which can meet the needs of general household use.

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