2 layers195.6 × 35.6 mm

MCB-1
peon374/MCB-1
This is a rebuild of the MCB-1 for anybody who has the sound card it connects to.
34 parts
Boards in 1 GitHub repository, designed in KiCad, that use the H11L3 by Everlight Electronics (-55℃~+100℃ 1 10mA 1Mbit/s 250mW 3V~16V 4us 4us 5kV DC DIP-6 Logic Output Optoisolators ROHS). See how each wires it, with its parts, size, README and files; the H11L3’s symbol, footprint and pinout are on its own page.

peon374/MCB-1
This is a rebuild of the MCB-1 for anybody who has the sound card it connects to.