Neon Display for a Vacuum Tube Calculator

From  on Hackaday blog:

Neon Display for a Vacuum Tube Calculator

When it comes to vintage displays, everyone gravitates to Nixies. These tubes look great, but you’re dealing with a certain aesthetic with these vintage numeric tubes. There is another option. For his Hackaday Prize entry, [castvee8] is making seven-segment displays out of vintage neon lamps. It looks great, and it’s the basis of an all-vacuum tube calculator.

The core of this build are a few tiny NE-2 neon bulbs. These are the same type of bulbs you’ll find in old indicators, and require somewhere around 100 volts to fire. These bulbs are then installed in a 3D-printed frame, giving [castvee] a real seven-segment display, a plus or minus sign, and an equals sign. It’s the beginnings of a calculator, right there.

One of the recent updates to this project is controlling these displays with modern logic. That might be a bit of a misnomer, because [castvee] is using diode steering and a TTL chip to cycle through the numbers 1 to 4. The actual code to do this is running on a microcontroller, though, so that might get a pass. This is just a test, though, and the real project looks to be an all-vacuum calculator. The project is still in its early stages, but there are still months to go in the Hackaday Prize, and we can’t wait to see what comes out of this project.

Neon Display for a Vacuum Tube Calculator

Turning The Beaglebone On A Chip Into A 3D Printer Controller

UPDATE: Thomas Sanladerer interviews Elias Bakken about the Revolve board

writes on the Hackaday blog:

Turning The Beaglebone On A Chip Into A 3D Printer Controller

It’s understood that 3D printers and CNC machines need to control motors, but there are a few other niceties that are always good to have. It would be great if the controller board ran Linux, had support for a nice display, and had some sort of networking. The usual way of going about this is either driving a CNC machine from a desktop, or by adding a Raspberry Pi to a 3D printer.


The best solution to this problem is to just drive everything from a BeagleBone. This will give you Linux, and with a few motor drivers you can have access to the fancy PRUs in the BeagleBone giving you fast precise control. For the last few years, the Replicape has been the board you need to plug a BeagleBone into a few motors. Now, there’s a better, cheaper solution. At the Midwest RepRap Festival this weekend, [Elias Bakken] has unveiled the Revolve, a single board that combines Octavo Systems’ OSD3358 ‘BeagleBone On A Chip’ with silent TMC2130 motor drivers from Trinamic. It’s an all-in-one 3D printer controller board that runs Linux.


The specs for the Revolve are more or less exactly what you would expect for a BeagleBone with a 3D printer controller. The main chip is the Octavo Systems OSB3358, there are six TMC2130 stepper drivers from Trinamic connected directly to the PRUs, 4 GB of eMMC, 4 USB host ports, 10/100 Ethernet, 1080p HDMI out, and enough headers for all the weird and wonderful 3D printers out there. The software is based on Redeem, a daemon that simply turns G-code into spinning motors and switching MOSFETs.


The price hasn’t been set, but [Elias] expects it to be somewhere north of $100, and a bit south of $150. That’s not bad for a board that effectively does everything from online printer monitoring to real-time motion control. There’s no date for the release of this board, but as with most things involving 3D printer, the best place to check for updates is Google+.

You can also checkout the official product page for more info:

Revolve: Replicape has evolved

Turning The Beaglebone On A Chip Into A 3D Printer Controller

Hackaday’s Irish Excursion is on 7 April

Try something a bit out of the ordinary with us on 7 April. Spend a Saturday with Hackaday in Dublin without really knowing what to expect. This is the Unconference format, and we’ve fallen in love with the spontaneity and consistently fascinating talks that come out of it.

We’ve booked a fantastic hall in the Temple Bar district of Dublin, lined up snacks throughout the day and dinner for all who attend, plus there’s an after bar and we’ll buy the first round. All of this is yours if you grab one of the rapidly disappearing free tickets.

via Hackaday’s Irish Excursion is on 7 April

Hackaday’s Irish Excursion is on 7 April

DIY 5V-3V Switching Converter in the Space of a TO-220 Package

From  on the Hackaday blog:

DIY 5V-3V Switching Converter in the Space of a TO-220 Package

We’re suckers for miniaturization projects. Stuff anything into a small enough package and you’ve probably got our attention. Make that something both tiny and useful, like this 5-volt to 3.3-volt converter in a TO-220 sized package, and that’s something to get excited about. It’s a switch mode power supply that takes the same space as a traditional linear regulator.

Granted, the heavy lifting in [Kevin Hubbard]’s diminutive buck converter is done by a PAM2305 DC-DC step-down converter chip which needs only a few supporting components. But the engineering [Kevin] put into this to squeeze everything onto a scrap of PCB 9-mm on a side is impressive. The largest passive on the board is the inductor in 0805. Everything else is in 0603, so you’ll be putting your SMD soldering skills to the test if you decide to make this. Check the video after the break for a speedrun through the hand soldering process

The total BOM including the open-source PCB only runs a buck or two, and the end result is a supply with steady 750-mA output that can handle a 1-A surge for five seconds. We wonder if a small heatsink tab might not help that; along with some black epoxy potting, it would at least complete the TO-220 look.

[Kevin]’s Black Mesa Labs has a history of turning out interesting projects, from a legit video card for Arduino to a 100-watt hotplate for reflow work that’s the size of a silver dollar. We’re looking forward to whatever’s next — assuming we can see it.

DIY 5V-3V Switching Converter in the Space of a TO-220 Package

World Create Day in Portland this Saturday

Screenshot from 2018-03-15 11-56-33.pngHackaday World Create Day is this Saturday, March 17th, in many cities around the world including Portland at Ctrl-H PDX Hackerspace:

World Create Day @ ^H PDX Hackerspace

Saturday, Mar 17, 2018, 12:00 PM

CTRLH – PDX Hackerspace
7608 N Interstate Ave Portland, OR

6 Hackers Attending

• What we’ll do Portland Hardware Hackers converge on ^H PDX Hackerspace for a day of making things of all sorts, especially Hackaday Prize entries! World Create Day is a day for you to work on your own project, start a new project, and collaborate with others in your community simultaneously with people all over the world. ONE BIG DAY OF CREATION….

Check out this Meetup →


World Create Day in Portland this Saturday

Nicely Engineered Boost Converter Powers Nixies from USB Charger

Love them or hate them, Nixies are here to stay. Their enduring appeal is due in no small part to the fact that they’re hardly plug-and-play; generating the high-voltage needed to drive the retro displays is part of their charm. But most Nixie power supplies seem to want 9 volts or more on the input side, which can make integrating them into the typical USB-powered microcontroller project difficult.

Fixing that problem is the idea behind [Mark Smith]’s 5-volt Nixie power supply. The overall goal is simple: 5 volts in, 170 volts out at 20 mA. But [Mark] paid special care to minimize the EMI output of the boost converter through careful design, and he managed to pack everything into a compact 14-cm² PCB. He subjected his initial design to a lot of careful experimentation to verify that he had met his design goals, and then embarked on a little tweaking mission in KiCad to trim the PCB’s footprint down by 27%. The three separate blog posts are well worth a read by anyone interested in learning about electronics design.

Now that [Mark] has his Nixie power supply, what will become of it? We can’t say for sure, but it’ll be a clock. It’s always a clock. Unless it’s a power meter or a speedometer.

via Nicely Engineered Boost Converter Powers Nixies from USB Charger — Hackaday

Nicely Engineered Boost Converter Powers Nixies from USB Charger

Join Hackaday And Tindie At The Southern California Linux Expo

Do you like Open Source? Join Hackaday and Tindie at the largest community-run Open Source conference in North America. We’ll be at the Southern California Linux Expo next week, and we want to see you there.

What’s happening at SCALE this year? Amateur radio license exams, a PGP signing party, Bad Voltage Live and The Spazmatics, and a ton of great talks. Hackaday and Tindie will be at SCALE Friday through Sunday, showing off the coolest parts of Hackaday,, and our lovable robotic dog, Tindie.

We’ll be handing out t-shirts and stickers, and we’ll be giving tours of the SupplyFrame Design Lab located just two blocks away from the convention center. The Design Lab is a crown jewel of our corporate overlord’s emphasis on Open Hardware, and if you want to see where the magic happens, this is your chance. We’ll be running tours of the Lab on Friday, so find the Hackaday and Tindie crew in the expo area around 3:40 PM.

via Join Hackaday And Tindie At The Southern California Linux Expo

Join Hackaday And Tindie At The Southern California Linux Expo