Minimalist Radio

A very cool little crystal radio, with a unique "crystal" over at The SWLing Post: 
https://swling.com/blog/2019/11/am-radio-from-a-hand-wound-coil-and-an-oxidized-british-penny/

The fact that it was tuned to a station playing The Clash's London Calling when he got it to work just makes this video all the sweeter.

I really need to build another one of these again fairly soon.  However... I will continue to enjoy my triple-conversion superhet with its plethora of digital filters for the time being.