Last time, I wrote an article about how to connect half-holes pcb without soldering, I give it a name called CDBITE:
But CDBITE only suitable for two sides half-holes pcb, if we want to connect a pcb with more than two sides, we can use another method described below:
Video you might be interested in: "Special Soldering Tricks (by duke)"
(Link for Mainland China: https://v.youku.com/v_show/id_XMzgwNjExODM4NA==.html)
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