Remove R8 and connect a resistor of 10K between pin 5 and pin 8. Two resistors of 10K are used to divide the voltage of a single power supply. There is a mistake on the first floor. C 1 is an AC feedback capacitor, and the signal is not short-circuited. Moreover, this circuit is powered by a single power supply and must not be disassembled. C 1 = 65438 is recommended. Do as I say, and the landlord's circuit will definitely work normally. Good luck!

Later, this circuit was great! I simulated it with proteus.