While driving a relay with a transistor is something fundamental ... [Hulk] was able to design a PCB with 12 modules on it, presumably saving fabrication costs. He can then easily populate ...
To support loads of widely varying sizes, the PCB supports an optoisolator that switches up to 1 A, a MOSFET that switches up to 2 A, and an on-board relay or SSR that can switch up to 3 A.
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