| 323 / | HD | ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS |
| 220 | ![]() | IN SHUNT WITH SOURCE OR LOAD {7} |
| 221 | DF | .~> Photo responsive |
| 222 | DF | .~> Using choke and switch across source |
| 223 | DF | .~> Using a three or more terminal semiconductive device {3} |
| 227 | DF | .~> Using electronic tube {1} |
| 229 | DF | .~> Using diode {2} |
| 232 | DF | .~> Using inductor |
| 233 | DF | .~> Using impedance |