Nixie tube clock in voltmeter case

Furniture & Lighting Technology
Nixie tube clock in voltmeter case

MAKE Flickr pool member shklaw found an old voltmeter in the trash and made it into this awesome Nixie tube clock.

These Nixie tubes are NL-5440A’s. The banana sockets were replaced with switches to set the hours and minutes. When the rotary switch on the left is set to OP, the clock is off, when it it’s set to AC, the clock is on (but can’t be set) and when the switch is set to DC, the clock it still on and you can set the time using the push buttons. The ohms adjust dial on the right controls the brightness of the blue up-lighting (fully off to quite bright!). I used the schematic and PIC code from this site.

[via HackedGadgets]

4 digit multimeter Nixie clock

Complete Nixie tube coverage on Make: Online

Discuss this article with the rest of the community on our Discord server!

Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. His free weekly-ish maker tips newsletter can be found at

View more articles by Gareth Branwyn


Ready to dive into the realm of hands-on innovation? This collection serves as your passport to an exhilarating journey of cutting-edge tinkering and technological marvels, encompassing 15 indispensable books tailored for budding creators.