Design and Making of AB Terms Amplifiers ----- Class AB Amplifier

Design and production of AB type headphone amplifiers, Class AB Amplifier Keywords: Design and production of the AB type headphone amplifier Design and production of Class-AB headphone amplifiers The low-missing headphone amplifier described herein is a modified type of OP + extension. The signal is sent to the op amp after R1, 2 / C1 low pass filter, and the right channel output is composed of Ic and transistors Q1, 2, 3, 4. The amplifier is determined by Q1, 4 / R9, 10, and the output stage is a complementary push amplifier of static 8 mA, and a negative feedback is obtained by R3, 4, R5, 6. Be Be Sine wave does not distortion output is as follows: Pure resistance load output voltage output power RMS32ou 5.5V 950MW150ou 8.8V 520MW330ou 9.8V 300MW680OU 10V 150MW Be The power supply is powered by the positive and negative dual power supply. Be Simple three-terminal regulation is in parallel, and uses LM431 to raise the fixed voltage of the plateau 7815. Be Since the OCL structure is used to protect the safety of the earphones, the boot delay is designed and the zero voltage offset is designed, as shown: Be The high-director characteristics of the field effect tube are easy to design the RC delay line, and the actual production delay time is 1s. Be The actual test is also very satisfied:

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