2 layers

Preamp
ybabs/PorpDAQ
Design Files for a STM32-Based Underwater Acoustics data acquisition board for harbour porpoises
42 parts6MIT
Boards in 1 GitHub repository, designed in KiCad, that use the LMH6643MA by Texas Instruments (-40℃~+85℃ -5V~5V 1.5uA 130MHz 130V/us 17nV/√Hz@100kHz 1mV 2 2.7V~12.8V 2.7mA 3.4uV/℃ 75mA 800nA 95dB Rail-to-rail output SOIC-8 Operational Amplifier ROHS). See how each wires it, with its parts, size, README and files; the LMH6643MA’s symbol, footprint and pinout are on its own page.

ybabs/PorpDAQ
Design Files for a STM32-Based Underwater Acoustics data acquisition board for harbour porpoises