The Final Preamplifier for the acousic disdrometer has been designed and built and is working well. Below are a few pictures. The only thing that I would do differently next time is make the whole thing single supply rather than dual supply. Becuase I have used a rail splitter and connected the ground from that to the ground on the outputs, when connecting to an oscilloscope, the non-earth potential shorts against the oscilloscopes ground which is connected directly to earth. Short answer is the power pack -> oscilloscope is creating a big circuit so when trying to force the ground to some other potential (mid-rail for example) it’s never going to win!
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