327 / | HD | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
100 | DF | SIGNAL CONVERTING, SHAPING, OR GENERATING {29} |
178 | DF | .~ Rectangular (e.g., clock, etc.) or pulse waveform amplitude control {2} |
180 | .~.~ Limiting, clipping, or clamping |