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How to setup negative -10 V for an op-amp to be designed on a PCB? I read that -10 V can be obtained from a power supply by connecting positive to ground and negative of the supply to the node where we want -10 V.
How can we do it if we have only a single +10 V source and need to generate -10 V and +10 V for discrete op-amp operation? Is it possible to obtain without using additional components?
It's not possible without additional components. The only way is with some kind of switching supply, either inductor based or capacitive charge pump.
There are packaged DC-DC converters (modules) which can be used in various ways, however 12V and 15V are more common nominal input and fixed output voltages.
