DIY Power Supply Thread - Questions and Help

An op amp cannot generate voltages outside its supply rails (most cannot even hit the supply rails).

There are ways to generate a negative supply rail from a positive supply, but they require non-trivial circuitry (and/or non-trivial PCB layouts).

I’d recommend getting a real supply, e.g. one of the frequency central ones. They’re cheap and easy to build and troubleshoot. See these threads for more pointers:

(might move this post to the latter in a bit)

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