A wonderful series written by a real life engineer. I read them as a kid and read them to my children. (As did several of my friends.) Some of the details are

A wonderful series written by a real life engineer. I read them as a kid and read them to my children. (As did several of my friends.) Some of the details are a bit dated. The stories are meant to be contemporary, but Bertrand Brinley wrote them in the 1960s. He also set them in a small town which was already a bit dated by then. The tech is also from a different era. These boys were ham radio users which gave them a few advantages since most of the world didn't use the radios or the cell phones that weren't invented yet. Computers and the Internet hadn't been invented yet but you can tell from reading that the club members would be the first to adopt tech like Linux. The stories are generally optimistic about the powers of technology, but less than optimistic about the adults who are often clueless or prankworthy. That's a common theme in YA fiction, I suppose. Someone needs to be the butt of the jokes or a story doesn't work. Highly recommended.