Use the positive and negative power supply BOM composed of domestic dcdc chips.
After a few dollars, you will no longer need to connect a big duck converter to play with op amps.
Note that the input is prohibited to exceed 6v, otherwise FP6291 will breakdown
the load. At 10ma, the positive voltage ripple is about 20mv. VPP negative voltage The ripple is about 40mv. When VPP
uses USB input, it outputs about ±12v.
When 100mA uses the pin header to connect to an external high-current 5v power supply, it outputs about ±12v. 500mA.
Note that C4 and C5 need MLCC with a voltage of 25v. The rest of the capacitors can
change the feedback with a voltage of 16v. The resistor voltage dividing ratio can be adjusted between ±9-15v
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