2 layers100 × 74.8 mm

Boards in 1 GitHub repository, designed in KiCad, that use the PKMCS0909E48H0-R1 by Murata (-40℃~+85℃ 12.5V 3.2mm 4.8kHz 72dB 9mm 9mm Passive (Externally Driven) Piezoelectric SMD SMD,9x9mm Buzzers ROHS). See how each wires it, with its parts, size, README and files; the PKMCS0909E48H0-R1’s symbol, footprint and pinout are on its own page.
