Instructables
Picture of Nixie Tube Music Visualizer
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A hypnotizing music visualizer inspired by those little bars in the top of iTunes. Fourteen Russian IN-13 Nixie bargraph tubes are used as the display.

The length that each nixie tube lights up represents the volume of a certain frequency in the music, 7 different bands for both the left and right channels.



I designed and built this over a month my junior year in high school. This instructable will go over my design process and the construction, hopefully aiding anyone who wants to build one of their own.
 
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Step 1: Design Process

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The goal is to make an interesting display that would show the volume levels of various frequency bands in an audio signal, as in many music players and on the front of some hi-fi audio equipment. There are three major points the project would focus on:

  • Minimizing cost: In the process of designing the visualizer, I found this simple VU meter with a nixie display utilizing an exotic IC to convert an audio signal into a volume level. While convenient, it's manufactured by a small company, and each piece would cost over $5 (for me, nearly $80 in those alone!) For simplicity and for my wallet, this only uses simple, cheap, and mass-produced parts. Also because of cost, I decided that 10K ohm resistors would be used for just about everything, so I could buy a few hundred for around $3.
  • Analog only: Using a digital signal processor was a possibility, but programming a DSP is fairly difficult, and the cost of DACs for the input and ADCs to drive the output began to raise the price too far. So only analog parts such as op-amps and comparators would be used.
  • Adjustability: After Nixie IN-13 tubes were chosen as the display, I realized that the only documentation was in Russian (or poorly translated English) and not very informative. Not knowing anything at all about how much it took to light it up any specific length (aside from less than 4 milliamps), everything about this design would be adjustable.
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mnedix18 days ago

Great instructable, I can't wait to build it. Do you have, by any chance, a workaround regarding the log-to-lin converter? 8 AOs per band seems a bit of an overkill.

ericps11 year ago
Hey, really awesome job on this, I've been working on figuring out how to build a Nixie graphic EQ myself and this has definitely given me some guidance. For the log to linear conversion I was looking at a slightly different approach though. I would be curious of your thoughts on using the anti-log converter discussed in this paper as opposed to your method. Only concern is it doesn't discuss a "fast anti-log converter," which would be needed since the normal one would be too slow. I'm hoping I'll be able to derive it based on the other circuits in the paper though. http://s.eeweb.com/articles/2010/12/16/Log-Converters-1292533187.pdf
mnedix ericps118 days ago

Hi Eric, did you succeed in creating a log converter out of that whitepaper? Could you please share the schematic?

Nighter3D4 months ago

Oh very nice. this project inspired me to make my own variation. Altough that one would be partly Digital.

Im working on a small scale version that uses a ATMega, a MSGEQ7 Spectrum analyzer IC and a simple 8-channel DAC IC(TLC series). The output voltage is converted to a controlled current by aid of a High-voltage Transistor. Right now im experimenting with a Fast-Hartley-Transform which suprisingly can work at a decent speed on a lowly ATMega if willing to work with less accurate reading(8-bit). Need to filter the signal a bit though.

Anyway thanks for the inspiration! ^^

fastcar1237 months ago

This is kool. I want to make it for my college project. I do have a question though. if I build the entire circuit in full but I only use lest say 10 tubes total, would the extra channels simply not be displayed, or would this be detrimental to the rest of the circuit. I only ask because I want to build the full circuit, but I don't have the money for so many tubes.

mmcgo fastcar1236 months ago

I haven't made this one myself yet, but I'm willing to bet you would need to expand the band-pass filters to cover the parts of the spectrum that you are missing. You wouldn't want to leave out the upper or lower bands, but you could "stretch" all of the bands so that 5 tubes per channel would cover the same 20 - 20000 Hz range that 7 tubes cover in this guide. You might want to look into a lower Q factor for the filters.

Where can I get the shopping list?
Jakob28032 years ago
Very nice! Did you use EAGLE for drawing the schematic? :)
Aleator7772 years ago
This is really terrific. I love seeing nixie-based projects!
garage man2 years ago
Thank you for the great instructable, very detailed. I was especially excited to see the filter for different frequencies as I have been looking for a good low-cost design to build
agray92 years ago
Dude if u could hook that up in your car that would be tight!
Sandisk1duo5 years ago
great instructable, but a little too complex for my tastes and chance that you're going to sell pre-built circuit boards?
Senator Penguin (author)  Sandisk1duo5 years ago
I'm working on a smaller, modular, and cheaper version, which I might sell in a kit form or just make public on batchpcb.com so that anyone can get their own PCBs made.
Please do, I'm sure you could sell quite a few!
dquinnell2 years ago
I am very interested in building a project like this, the parts list says 170 (One Hundred and seventy) 10k resistors are used, is that a typo or are there really that many 10k resistors used? If i were to build a one channel visualizer, would i take this parts list and divide it by half (other than the parts where only 1 is used of course)?
djjoec3 years ago
I would like to make one of these for my  Melbourne DJ hire company. What would the total cost be?
basses should be on the left side but you have it reversed on the left EQ is it on purpose?
Yep, symmetry is pretty
Is there any way to add a couple more frequency bands? I have a 10 Band Stereo EQ that this would go nice with in a custom box. Does this use converted AC voltage or just a battery?
Kryptonite3 years ago
This is incredible, what was the total cost of this project for you?
ben_xman3 years ago
Wow! That's really impressive, especially for someone so close to my age! You should really consider going to MIT or CalTech. So anyhow, what made you want to use nixie tubes?

Oh, and I was wondering a couple things. Could you use, say, five LEDs instead of the tubes and make it small enough to fit in a pair of headphones (I could always add a bit to the sides, bottoms, or even the chord itself)? I was thinking of making a headset mod with a circular visualizer on the side. Any ideas? Thanks in advance! And good luck in the future!
i would love to have this also! or maybe something with a microphone so you could take it anywhere and have it listen to anything!
Data6433 years ago
Great Instructable, especially for a Freshman. I wish I knew electronics that well.
garywpalmer3 years ago
Very nice indeed. When I was an Electronic Technician in the US Navy (early 1970's), one of my favorite pieces of equipment was a frequency analizer with a nixie tube read out. I'm glad to see nixie tubes making a comeback in a lot of projects.
Very nice! I'm jealous that I never made anything quite that impressive when I was at school in electronics! My final A2 project was a greenhouse climate control system. Never used that dot matrix board but it seems to be a nice compact solution. We had PCB manufacturing facilities at school so I was lucky enough to be able to make my PCBs there. If anyone is interested in the Design, Development and Manufacture of a PCB follow this link to a series of video that I made: http://bit.ly/iNr6Z4
postlife3 years ago
Would it be possible to make one with more tubes? I am looking into building a 4' visualizer to mount to the front of my keyboard stand. Thanks.
Senator Penguin (author)  postlife3 years ago
Of course, this is pretty scalable. A while back I was working on making this modular, having each tube attached to the side of a long, narrow PCB, and they could be stacked.
The only things you need to add more is more power, and redesign the filters to cover the audio range better. In other words, you need math.

http://www.youtube.com/watch?v=x0NJhbx9IYM
This guy did something similar, but he went digital with it (FFT) and has some crazy power boards.
i put it in my xbox hacking lol the audio from my xbox to go on the cover it looks so cool thanks :)
ohh post a pic
Ok i am building a bass guitar right now and was thinking 2 of those nixies would be perfect on either side of the 4 strings, so if anybody is interested in some 1 on 1 chatting about how this could be done i would really appreciate it
First of all, this is a very complex project for a junior in high school to accomplish. so bravo on that. (I barely had my soldering skills and basic circuits at that age) . Really a unique and amazing build. This would look really good with a more modern enclosure and of course with the right music.
Wow, man! This is gorgeous! This instructable got me into both Nixies and Honeycut!
Stormrage4 years ago
Its awesome... just im wondering where can i find those tubes, can it be bit simpler and  can it work with microphone?
luhe989224 years ago
Hi there! Could I use a more common LM339 voltage comparator instead of the ts3704 which is giving me a hard time to find?
Senator Penguin (author)  luhe989224 years ago
You would need to adjust the section in between the comparators and the display op amp.  The TS3704 has push-pull outputs, which considerably simplifies things.  The LM339 has pullup resistors on the outputs, which makes it impossible to just attach all of the outputs with resistors to average them.
bman224 years ago

I have been looking for exactly this for a different project i am working, my only problem is that i need a variable voltage between 0 and 5 volts instead of your 12v current system. Can anybody here help me in acheiving this. Its a bit over my head, so i would really appreciate some help.

satanklawz5 years ago
Great project! I've ordered most of the same parts. What are the voltage requirements for the capacitors? You wouldn't happen to still have the parts list from mouser and digikey?
Based on a comment you made before, is the information below correct?

14x    100uF electrolytic polarized capacitor 25v
14x    4.7uF electrolytic polarized capacitor 25v
18x    1uF capacitor 25v
Are the below capacitors multilayer ceramic, or mica? Would ceramic suffice (I didn't see polarity noted for any of them)?

13x    .1uF capacitor (should this be 14?)
8x    .01uF capacitor
4x    1000pF capacitor
I love it!

Thank you for writing and shareing this project. :)


fade4005 years ago
Does the value of Cin matter ?
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