Flexible PCB, self-adhesive, component adapters Posted byIan March 21, 2011 6 Comments on Flexible PCB, self-adhesive, component adapters Protoflex is a set of flexible circuit board stickers for SMD development. Peel off a footprint, stick it on 0.1″ protoboard, and solder surface mount parts directly on the sticker. Brilliant use of flexible PCBs. Thanks Kelvin! Via contact form.