MVC PS Spin notes: U60 optoisolator is not needed. Tie ACM+ to K4 -1 Tie ACM- to B Bus RTN J6 is "vestigial" Diodes are zeners, not TVS: TVS_CDSOT23-T36C D84,D85,D86,D89,D90,D91,D92,D93,D94,D95,D96,D97,D98,D99,D100,D103 sot_23_3 Digikey CDSOT23-T36CCT-ND Replace with: STS232360B151 Digikey: 283-STS232360B151CT-ND Large common mode choke at SE corner, move it south All VN750 High Side Switches need a 100k 0603 pull-down across pins 1 and 2 Add the Humidity and Pressure sensors to the power board Add the memory chip to the power board I2c Addresses: U37 is 0x37 ( not 0x1F ) U119 is 0x69 ( not 0xD2 ) U120 is 0x6F ( not 0xDE ) Latching relays K3 and K7 5V_ISO on one side, other to GND thru a FET Try 3V version, drive coil w/ 3V3_ISO RDF Backup Battery return tied to BUS_GND s/b GND_ISO ADC128 Vmon Chip gets added to the Isolated Power side on the MVC_PS pcb as well as on the Trig_PPS_PC104 pcb Environmental Sensing chips move to the MVC_PS pcb Switching regulator for RDF Run off the Non-Isolated Bus How to Blue Wire this ?