We love close-up pictures of intricate work, and [w] hits the spot with a tiny joule thief in a fuse case (social media post, embedded below) powered by an old coin cell from a watch. It’s so tiny!

The PCB 1500/PCB 1500 Plus is a Peltier-controlled external water recirculator ideal for all thermostatted cell holders. As a stand-alone external accessory, it requires no electronicmor physical ...