Quantity   Component name
1 × DLP2232 USB to UART bridge module in 40-pin DIP
4 × MAX485 Switches and Multiplexers / Analog Switches and Multiplexers
1 × LM2596HV DC-DC module from eBay, the 60V to 9V buck converter
2 × LM2904 (LM358) Dual op-amp, used for voltage detectors
1 × MAX232 logic-to-RS232 level converter
1 × 78L05 Power Management ICs / Linear Voltage Regulators and LDOs