snap ciruit book

https://www.pololu.com/file/download/SnapCircuitProjects1-101.pdf?file_id=0J172 https://www.robotshop.com/media/files/pdf/elenco-snap-circuits-300-in-1-manual.pdf

https://www.elenco.com/wp-content/uploads/2017/10/SC-750_REV-E-3.pdf