Voltage stabilization circuit diagram with synchronous adjustment of positive and negative voltages

In order to synchronize the positive and negative voltage adjustment, there should be R1=R2 in this circuit. The actual value is 4.4~22KΩ (1~0.5%). The value of R3 is R3=0.5R2. When the potentiometer resistance value is 10~25KΩ, the current limiting resistor R4 is 1.8KΩ. When the voltage regulation value of the integrated voltage stabilizing circuit is 5V, the output low voltage of the circuit is also 5V. The maximum output voltage is equivalent to UE-2V, so it is related to the allowed input voltage of the integrated circuit.