Socket P1 connects to a nominal 10Vac PlugPak.
D1 and D2 form two 1/2 wave rectifiers to give us a split rail supply of ± 10Vdc.
U11 and U20 regulate +5, -5 for digital circuits.
Analog supplies +5, -5 are regulated by an isolated pair of 3 terminal regulators U9, U10.
Inductor L1 isolates the Analog ground from the Digital ground at high frequencies. In mixed signal designs it is essential to guard against digital noise, such as like ground bounce, getting into the analog circuits.
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