| 323 / | HD | ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS |
| 234 | DF | OUTPUT LEVEL RESPONSIVE {6} |
| 247 | DF | .~ Using a transformer or inductor as the final control device {5} |
| 259 | DF | .~.~ Having a winding in series with the source and load (e.g., buck-boost) {4} |
| 261 | ![]() | .~.~.~ With saturable reactor in control circuit |