Designing the interface circuit board involved reading through the USB Type-C Connector Specification, published by the USB-IF, which details how the reversible connector is implemented electrically, and gives appropriate values for the pullup/pulldown signaling resistors. After developing the appropriate schematic, parts for the type-C connector and the FFC connector were selected and sourced, and footprints were created in EAGLE for board layout. As an alternative to the FFC connector, a separate surface-mount footprint for the original flat flex cable from the mini-B USB connector was added, if available for reuse. Shown below are the schematic and layout, as well as photos of the assembly process.
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