| 323 / | HD | ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS |
| 304 | DF | SELF-REGULATING (E.G., NONRETROACTIVE) {2} |
| 311 | DF | .~ Using a three or more terminal semiconductive device as the final control device {1} |
| 312 | ![]() | .~.~ For current stabilization {2} |
| 313 | DF | .~.~.~> To derive a voltage reference (e.g., band gap regulator) {1} |
| 315 | DF | .~.~.~> Including parallel paths (e.g., current mirror) {2} |