This tiny circuit is actually comprised of four blocks. The first two stages are a rectifier/doubler. That's the 2x diode and 2x capacitor bridge. It turns AC to DC and doubles it. The third stage is the splitter stage. It splitts a single rail power supply into a split rail power supply. Usually this thing divides the voltage in half but since we doubled it first, now it's gonna be the normal maximum on both rails. The last stage is i normal voltage regulator stage, which stabilises the voltage and makes it usable for ripple sensitive circuitry like preamplifiers and oscillators.
