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Features: AC – DC Conversion Double output voltages (Positive – Ground – Negative) Adjustable positive and negative rails Just a Single-Output AC transformer Output noise (20MHz-BWL, no load): Around 1.12mVpp Low noise and stable outputs (ideal to power Opamps) Output Voltage: +/-1.25V to +/-25V Maximum output current: 300mA to 500mA Cheap and easy to solder (all component packages are DIP) A double output low noise power supply is an essential tool for any electronics enthusiast. There are many circumstances that a double-output power supply is necessary such as designing pre-amplifiers and powering OPAMPs. In this article, we are going to build a linear power supply that a user can adjust its positive and negative rails independently. Moreover, just an ordinary single-output AC transformer is used at the input. References Source: https://www.pcbway.com/blog/technology/Low_Noise_Adjustable_Linear_AC_DC_Power_Supply.html  LM317 Datasheet: http://www.ti.com/lit/ds/slvs044x/slvs044x.pdf  LM337 Datasheet: http://www.ti.com/lit/ds/symlink/lm137.pdf : Schematic Symbol and PCB Footprint for LM317: https://componentsearchengine.com/part.php?partID=248007 : Schematic Symbol and PCB Footprint for LM337: https://componentsearchengine.com/part.php?partID=290650 : Altium Plugin: https://www.samacsys.com/altium-designer-library-instructions