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Converts 5v to 3.3v
The single-sided PCB design is simple enough that it can be etched at home.
Uses two Texas Instruments: SN74LS126ANE4
Buffers & Line Drivers Quad Bus Buffer With 3-State Outputs
http://nl.mouser.com/ProductDetail/Texas-Instruments/SN74LS126ANE4/?qs=sGAEpiMZZMutXGli8Ay4kP28D9wZ8SQIMqpIftnsrsk%3d
License
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Copyright (C) 2012-2021 Medlock, Herman, and Shaw
CERN Open Hardware Licence v1.2