2 layers39 × 24.5 mm

Boards in 1 GitHub repository, designed in KiCad, that use the TL081CP by Texas Instruments (-15V~15V 0℃~+70℃ 1 1.4mA 13V/us 18nV/√Hz@1kHz 18uV/℃ 30pA 3MHz 3mV 5pA 86dB Short-Circuit Protection、Latch-up suppression DIP-8 FET Input Amplifiers ROHS). See how each wires it, with its parts, size, README and files; the TL081CP’s symbol, footprint and pinout are on its own page.
