Main components

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Part NumberDescription
FR9888SPGTRStep-Down Adjustable 1 4.5V 23V 0.925V 20V 3.5A SOP-8_EP_150mil DC-DC Converters RoHS
LM358Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8

main schematic

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main board layout

main PCB render

Top PCB
Bottom PCB