Figure 3.4 Schematic of Wall Wart. On the left is the symbol for an AC plug. Each prong of the plug connects to one end of the primary of a transformer. There is no switch or fuse. The secondary connects to a diode bridge. The top end connects to the cathode of D1 and the anode of D2. The bottom end connects to the cathode of D3 and the anode of D4. The anodes of D1 and D3 connect to the lower output terminal. The cathodes of d2 and d4 connect to the upper output terminal. There is a capacitor connected between the lower and upper output terminals. This completes the verbal description.
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