Smartwatches may be all the rage these days with their notifications and fitness tracking, but sometimes you want the cool factor of technology combined with the simplicity of a standard wristwatch. Enter the ChronodeVFD: a cyberpunk-themed wristwatch cooked up by engineer and blogger J. M. De Cristofaro (aka "johngineer").
De Cristofaro had this to say about the making of this looker:
The ChronodeVFD is a personal project I've been working on for a couple of months. It's a wristwatch built around the IVL2-7/5 VFD display tube. I originally purchased a few of these tubes to build a standard desk clock, but after playing around with them, I realized I could probably build a wristwatch too. The tube has a number of features which make it more suited than most Soviet-surplus VFDs for this purpose.
- nominal 60mA filament current @ 2.4V, but still works with ~35mA @ 1.2V.
- It's small — only 1.25 x 2.25″
- It's flat, as opposed to the round tubes like the IV-18, which would be much clunkier in a watch design.
- can operate from a relatively low grid voltage of 12-13V (up to 24V)
- pulls only about 2.5mA/segment from the grid rail @ 12.5V. ("8″ = 20mA)
One other feature that I like about this device is that unlike nearly every other VFD tube, the IVL2-7/5 has no opaque or diffuse backing behind the digits. It's completely transparent front to back, which means that if you put it on top of a circuit board, you can (with a bit of backlighting) see the PCB below.
The wristwatch was built to be a costume piece, and thus sacrifices function for form with a relatively short battery life of 6-10 hours. Still, this is a pretty cool little homemade device. If you'd like to check the watch out further, including a detailed description of how it was built, click on over to De Cristofaro's blog here.