2 layers120 × 120 mm

Boards in 1 GitHub repository, designed in KiCad, that use the LM258P by Texas Instruments (-16V~-1.5V、1.5V~16V -25℃~+85℃ 150nA 2 20mA 2nA 300V/ms 3V~32V 3mV 40nV/√Hz@1kHz 700kHz 700uA 7uV/℃ 80dB EMI filtering/RF suppression DIP-8 Operational Amplifier ROHS). See how each wires it, with its parts, size, README and files; the LM258P’s symbol, footprint and pinout are on its own page.
