Split Rail Power Supply for RIAA Preamp

A split-rail power supply is a circuit that provides positive and negative DC voltage rails from a single AC transformer, and a pair of step-down voltage regulators. This type of circuit design usually requires an AC transformer with a centre tap on the secondary side, which becomes the circuit ground. This article shows how to design a simple split-rail power supply for generating +12 V and -12 V rails, which power the operational amplifier IC in the RIAA preamplifier project.

I already have an article for a general-purpose circuit design of a split-rail power supply circuit; therefore, you should refer to that as well when building this circuit. Although the circuit build here is on matrix board with eyelets, the other article is for a strip board build showing another way to build it.

Component List

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