Driver Board Makes Nixie Projects Easier Than Ever

We know, we know — yet another Nixie clock. But really, this one has a neat trick: an easy to use, feature packed driver for Nixies that makes good-looking projects a snap.

As cool as Nixies are — we’ll admit that to a certain degree, familiarity breeds contempt — they can be tricky to integrate. [dekuNukem] notes that aside from the high voltages, laying hands on vintage driver chips like the 7441 can be challenging and expensive. The problem was solved with about $3 worth of parts, including an STM32 microcontroller and some high-voltage transistors. The PCBs come in two flavors, one for the IN-12 and one for the IN-14, and connections for the SPI interface and both high- and low-voltage supplies are brought out to header pins. That makes the module easy to plug into a motherboard or riser card. The driver supports overdriving to accommodate poisoned cathodes, 127 brightness levels for smooth dimming, and a fully adjustable RBG backlight under the tube. See the boards in action in the video below, which features a nicely styled, high-accuracy clock.

From Nixie tachs to Nixie IoT clocks, [dekuNukem]’s boards should make creative Nixie projects even easier. But if you’re trying to drive a Nixie Darth Vader, you’re probably on your own.

Slimline Nixie Clocks

Everyone needs to build a Nixie clock at some point. It’s a fantastic learning opportunity; not only do you get to play around with high voltages and tooobs, but there’s also the joy of sourcing obsolete components and figuring out the mechanical side of electronic design as well. [wouterdevinck] recently took up the challenge of building a Nixie clock. Instead of building a clock with a huge base, garish RGB LEDs, and other unnecessary accouterments, [wouter] is building a minimalist clock. It’s slimline, and a work of art.

The circuit for this Nixie clock is more or less what you would expect for a neon display project designed in the last few years. The microcontroller is an ATMega328, with a Maxim DS3231 real time clock providing the time. The tubes are standard Russian IN-14 Nixies with two IN-3 neon bulbs for the colons. The drivers are two HV5622 high voltage shift registers, and the power supply is a standard, off-the-shelf DC to DC module that converts 5 V from a USB connector into the 170 V DC the tubes require.

The trick here is the design. The electronics for this clock were designed to fit in a thin base crafted out of sheets of bamboo plywood. The base is a stackup of three 3.2mm thick sheets of plywood and a single 1.6 mm piece that is machined on a small desktop CNC.

Discounting the wristwatch, this is one of the thinnest Nixie clocks we’ve ever seen and looks absolutely fantastic. You can check out the video of the clock in action below, or peruse the circuit design and code for the clock here.

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