Electrical Technology - 230 VAC to ±12 VDC Dual Power Supply Circuit Operation: https://www.electricaltechnology.org/2021/03/dual-power-supply- circuit-230vac-to-%c2%b112vdc.html | Facebook
What are some simple dual polarity power supply circuits using an Lm317 and an Lm337 but using a transformer without a center tap? - Quora
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