We're supposed to design an overall circuit that has a conductivity measuring capability, acoustic sensor capability, and temperature sensor capability. We're supposed to imagine our circuit is onboard an ROV controlled from a ship. the frequency is derived from researching the acoustic properties of water. However, I keep running into these complicated looking RF circuit diagrams, some of the concepts we havn't even covered yet. The input to the acoustic part is supposed to be a differential pair. The conductivity circuit already uses an oscillator to convert the d.c input from a battery to an ac signal.