CircuitsToday.com, ElecCircuit.com and ElectroSchematics.com have voltage regulator diagrams available. Schematics shown include those for floating regulators, switching regulators, dual voltage regulators, adjustable regulators and conversion regulators. All the sites have schematics for the popular National Semiconductor LM series, including the 1758 A, 2575, 2577, 309 and 317 models.
The websites also contain extensive projects and kits using voltage regulators that are available for hobbyists as well as electronic enthusiasts. Some systems that use voltage regulators include embedded systems, robotics, communications, general electronics and power electronics, as well as solar and sensor panel varieties. Some sites offer free technical support until the project is completed.