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USB Digital and SPI Interface PCB pattern (PDF download) 
PDF with the PCB design for the USB Digital Interface Module (double-sided), as used to drive the Expandable LED Christmas Tree.
Both layers are in a single PDF.
Cat No SC4779. Price: AUD $3.00
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Project: USB digital and SPI interface board
Other items relevant for this project:
USB Digital and SPI Interface PCB 
PIC16F1455-I/P programmed for the USB Digital and SPI Interface Module [1610718A.HEX]
Kit for the Digital Interface Module
Firmware (HEX and C) files for the USB Digital and SPI Interface Module
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