After a few fits and starts (finding a case I was happy with was really hard!) I’ve finally finished the TARDIS lantern necklace for my friend!
It consists of a small Tim Holtz Lantern that had an incandescent bulb powered by 2 AA batteries, which I retrofitted, removing the cheapo flashlight bulb and replacing itwith a white LED. The wires run through black necklace chain to a battery pack that my friend will wear tucked in her corset.
The battery pack is a cool little case from New Age Electronics (via Mouser) that combines space for 2 AAA batteries (more than enough juice for this) and space for a small circuit board on the opposite side:
Note that if you’re going to use the same box (which I really like) the battery “plates” are seperate, just make sure you order those on Mouser, too. The circuit board is a stripboard I got from ebay, cut and drilled to size. The wires are heatshrinked and come in through a hole in the side:
The circuit is basically the same thing as the Tesla Cane ATTiny, except running a “fade” program I tinkered with to get a more Doctor Who-like effect. Here is it in action (I love this thing in the dark!):