A second hand Radio Shack kit. They are a great piece of product design and come with lots of things to do instead of lots of words to think about. They recei

A second hand Radio Shack kit. They are a great piece of product design and come with lots of things to do instead of lots of words to think about. They receive criticism for this. But normalizing the construction of circuits and deemphasizing theory is a feature not a bug…there are books for that (and these days websites and YouTubes for that too). For less than 100 eBay units — often much less — you can get a time tested educational tool.