4 layers106 × 29.2 mm

Batterymeter
hb020/batterymeter
Handheld Battery AC and Time Domain characterization tool on Attiny series 2
145 parts20
Boards in 1 GitHub repository, designed in KiCad, that use the OPA4388ID by Texas Instruments (-40℃~+125℃ 10MHz 2.25uV 30pA 5V/us EMI filtering/RF suppression、Zero drift / auto-zero、Reverse-phase input protection Four channels SOIC-14 Precision Op Amps ROHS). See how each wires it, with its parts, size, README and files; the OPA4388ID’s symbol, footprint and pinout are on its own page.

hb020/batterymeter
Handheld Battery AC and Time Domain characterization tool on Attiny series 2

hb020/batterymeter
Handheld Battery AC and Time Domain characterization tool on Attiny series 2