With https://github.com/SciML/ModelingToolkitStandardLibrary.jl/pull/51, many components like `SineVoltage` or `StepCurrent` were removed in favor of combining a `Voltage` or `Current` source with basic blocks. The change has not been updated in the documentation: https://docs.sciml.ai/ModelingToolkitStandardLibrary/stable/API/electrical/#Analog-Sources