The design is rather spartan, using just three chips; a voltage regulator, a MAX3002 level converter, and an Atmel AT90USB162 as the main microcontroller. This chip has a built-in USB module ...
A voltage regulator "module" (VRM) is a voltage regulator in a replaceable unit. Regulators and stabilizers do the same thing. However, voltage regulators generally deal with output from DC power ...