2 layers57.6 × 53.3 mm

Shield Frequency meter STM32
zheksandr/Frequency-meter-based-on-STM32
Frequency meter based on STM32, which will utilize built-in HAL library
30 parts
Boards in 1 GitHub repository, designed in KiCad, that use the OPA210ID by Texas Instruments (-18V~-2.25V、2.25V~18V -40℃~+125℃ 1 100nV/℃ 132dB 18MHz 2.2nV/√Hz@1kHz 2.5mA 2nA 300pA 4.5V~36V 5uV 6.4V/us 65mA ESD protection、Reverse-phase input protection Rail-to-rail output SOIC-8 Precision Op Amps ROHS). See how each wires it, with its parts, size, README and files; the OPA210ID’s symbol, footprint and pinout are on its own page.

zheksandr/Frequency-meter-based-on-STM32
Frequency meter based on STM32, which will utilize built-in HAL library