Simple design to add some more I/O for 3D printer control boards. Working firmware is available but still in development. Prototype seems to work well.
N-Channel Logic Level MOSFET, 30 V, 100 A, 3-Pin SOT404, Tape and Reel
Q1, Q2, Q4, Q3
R1, R3, R5, R7, R2, R6, R4, R8, R9, R10
I1, I2, I3, I4
O1, O2, O3, O4, 12V
Single Output LDO, 800 mA, Fixed 5 V Output, 3.8 to 15 V Input, with Internal Current Limiting, 4-pin SOT-223 (DCY), -40 to 125 degC, Green (RoHS & no Sb/Br)