I admit it: I'm a total geek. I love electronics, programming, 3D art, vintage Apple hardware, and whisky. I'm always juggling half a dozen projects. I also enjoy documenting it all: my successes, my failures, my experiences... and everything geeky along the way.

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Nixie Clock V2 - Part II | Kevin Rye.net - Main

Kevin Rye

Geek Extraordinaire. Yeh, I said it.

Nixie Clock V2 - Part II

My IN-14 display board arrived quicker than I expected. It was only 9 days. It came out awesome.

DSC_0002-3

I like to socket my tubes in case I ever have to replace one in the future. Finding sockets on eBay is difficult, and expensive. I decided to try my hand at 3D printing my own. Easier said than done.

diyIN14tubesocket_0001

It was easy enough getting the pins in the holes, but trying to get the tubes in the pins was very difficult, and in the end proved to be an exercise in futility. The leads on IN-14s are usually rather long. These tubes are obviously used since the leads have been cut way down. Not to mention, there's solder on them. The leads are just a bit too short for the pins to properly grab them.

diyIN14tubesocket_0002

In the end, I just decided to solder the tubes directly to the board. The eBay seller stated that the tubes were new and tested, but seeing the state of the leads, I wasn't 100% convinced. Rather than solder all the leads, I decided to just solder the anodes so that I could test them out first.

in14clocktubesC_0003

I then connected the main board and applied power. I then grounded each of the pins to make sure that all the digits worked. As luck would have it, all the tubes work.

in14clocktubes

In order to keep all the tubes nice and straight, I devised a jig that I could slip over the tubes in order to keep them straight. I don't want my tubes looking like tombstones after an earthquake.

in14clocktubeholder_0001

I made the holes just a tad too small. Needless to say, they don't slide all the way down. If I push down on the jig any harder, I feel I may shatter one of the tubes. That, and I'm sure it'll be impossible to pull it off afterwards.

It's good enough. All the tubes are nice and straight, and well aligned with each other.

in14clocktubeholder_0002

I then soldered the rest of the nixie leads and added the blue LEDs. Some of the LEDs are not as straight as they should be, but I'm sure it's fine.

in14clock_blueLEDs_001

Using a battery pack, I applied power to the LEDs just to check them out. That looks awesome.

in14clock_blueLEDs_002

I can't solder in the IN-3 separator nixies until I make the case for it. I won't know how high they have to stand until the case is on. I got to work on prototyping the top first so I could nail down the hole placement.

3dprintedcasetest_0001

Nailed it.

3dprintedcasetest_0002

In my first nixie clock, the display board was connected to the driver board using standard-length double row headers. Unfortunately, adding the blue LEDs to the underside of the board makes it impossible for me to use these headers. They are no longer long enough.

nixieclockoldpins_001

I had to order some longer headers.

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These were actually too long. I cut them down about 3mm and soldered them in.

nixieclocknewpins_003

A perfect fit, and there's enough clearance between the chips on the driver board and the LEDs on the underside of the display board.

nixieclocknewpins_004

The moment of truth. I uploaded my sketch and verified that everything worked. So far, so good.

nixieclock2assembly_001

It was then time to solder in the IN-3s. Unfortunately, they are on the board backwards. Well, the footprint is facing the right way, but I think I mixed up which is the anode and which is the cathode when I connected them up in the schematic. I had to solder them in backwards and place some stripped wire insulation over one of the legs, and then twist them around so they are facing the right way. The insulation stops the leads from touching each other and shorting things out.

nixieclock2assembly_003

I then soldered in the button wires...

nixieclock2assembly_004

… and soldered in the buttons.

nixieclock2assembly_005

Looking good. Everything fits nicely.

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With all the electronics complete, it was time to finalize the case. I jumped back into SketchUp and got to work on the case.

Screen Shot 2017-05-20 at 2.09.37 PM

In order to save some time and PLA, I removed some sections of the walls. This will also help me see inside and gage how much clearance I have on the inside for squeezing in the wires and the power connector.

nixieclock2_prototype_case_001

nixieclock2_prototype_case_002

I then prototyped a bottom for it. Again, to save on time and material, I hollowed out the center.

nixieclock2_prototype_case_003

It fits really well, but I think I might incorporate some notches on the inside so that the bottom sort of clicks into place.

nixieclock2_prototype_case_005

Something like this….

Screen Shot 2017-05-20 at 2.50.48 PM

One last test….

nixie_clock2_final_case_0002

Boom. They snap together perfectly.

nixie_clock2_final_case_0003

Now I just need to print the final case in wood PLA and stain it.

See this project from start to finish:
IN-14 Nixie Tubes
Nixie Clock V2 - Part I
Nixie Clock V2 - Part II
Nixie Clock V2 - Part III