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Arduino's new DIY electronics starter kit has an UNO R4 board

A rduino boards are a popular choice for DIY electronics, but it's not always clear how to get started with building projects ...
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Can we get “printed” circuit boards which really are printed?

Printed-circuit boards (PC boards or PCBs) are literally the foundation of many of our electronic products. These copper-clad boards – often but not always using glass-epoxy FR-4 substrate, but ...