An amplifier circuit having a rotating input stage has a switching network connected to an input. The circulatory photobioreactor comprises a first cultivating part, a second cultivating part and a pump part connecting the first cultivating part and the second cultivating part. A sonar sensor module comprises a sonar transducer that is characterized by an omni-directional radiation pattern that may overlap an omni-directional radiation pattern of an adjacent sonar sensor module transducer. The neural fabric is to implement a synaptic time-multiplexed neuromorphic network. The mechanical broadhead maintains a low aerodynamic profile for proper flight via the deployable blades.