I was asked from many customers to build a similar kit but with an alternative display.
So Mr. Nixie has taken the EM800 Magilyzer and the former Nixielyzer kit, which is sold out, put them in a pot, added a hefty dose of the legendary Mr. Nixie Magic, and finally a new kit, the IN-9 Nixielyzer was created.
The IN-9 Nixielyzer is an analog audio spectrum analyzer, based around an analog analyzer chip. It offers the display of six selective audio bands:
63 Hz, 150 Hz, 330 Hz, 1 kHz, 3.3 kHz and 10 kHz.
As an extra feature, you can mix the signal of a build-in microphone to the display, to use the IN-9 Nixielyzer as a stand-alone device when no wired audio source is connected.
The IN-9 Nixielyzer operates with six vintage NOS (New Old Stock) IN-9 Nixie Bargraph tubes and has two RCA stereo in- and outputs (for easy daisy chaining the device within an existing audio path) and also two 1/8" TRS jacks for simple connecting your MP3 player, mobile phone plus headphone for listening etc.
Both signals (RCA and 1/8" TRS) are only internal mixed via an electronic zero ohms node and do not affect each other.
The IN-9 Nixielyzer uses no digital signal processor or FFT (Fast Fourier Transformation); so the display is stepless and fully in realtime.
Furthermore a modified dbx compandor ciruity was introduced to enhance the displayed dynamic range.
You surely know a VU meter, which shows the level of an audio signal, on the DIY market often build with LEDs.
The IN-9 Nixielyzer now separates this audio signal into six selective bands and show their special audio level within this frequency range:
- 63 Hz = Low Bass (e.g. Bassdrum)
- 150 Hz= Mid Bass (e.g. Bassguitar)
- 330 Hz = Low Mid (near concert pitch of the most musican instruments and lower end of the telephone frequency range)
- 1 kHz = Mid of voice frequency (e.g. the "beep" sound for indecent words in interviews)
- 3.3 kHz = Presence (e.g. "sch" in the word Schedule or the imitated sound of a steam locomotive and higher end of the telephone frequency range)
- 10 kHz = Heights (e.g. "sssss")
And as an absolute unique feature, the IN-9 Nixielyzer displays the level not on "ordinary" LED display or VFD display or on a computer screen or even in an App of your mobile phone but on six IN-9 Nixie Bargraph tubes made as surplus in the end of the 80's in USSR.
- PCBs with double sided silk screen.
- All necessary electronic components.
- All necessary mounting hardware.
- Complete enclosure with all necessary covers.
- 15 VDC wall mart power supply with EU mains or 12 VDC with adaptors for EU/US/UK/AU is included.
- On request 6 x IN-9 Neon filled tubes.
- DC-Power 12...15VDC 1A max.
- Power consumption 1...12 VA depending on volume, normally ~4 VA.
- Input impedance 22 kOhms.
- Very less generated heat.
- Stereo RCA in- and outputs, connected in parallel, for easy daisy chaining in an existing audio path.
- Two 1/8 TRS inputs, also connected in parallel, as an alternative for MP3 player, mobile phone, headphone etc.
- The signal of both output paths (RCA and 1/8 TRS) do not affect each other.
- Selectable audio channel for display (right / both / left).
- Build-in microphone signal can be mixed for display.
- 63 Hz, 150 Hz, 330 Hz, 1 kHz, 3.3 kHz and 10 kHz audio spectrum level are displayed.
- Build-in modified dbx compandor circuity for extended display dynamic range.
- Variable blanking time and limited current slew rate for minimizing the issues specially with Argon filled tubes.
- Easy to remove the small tube board for smooth and secure transport / shipping.
- 4 hour of your evening time with no hurry.
- A clear, well-lit area in which to work.
- Soldering station with fine tip and fine electronic solder.
- Multimeter to check the generated voltages.
- Electronic tools.
- A loupe may be helpful.
- TX10 (Torx) and slotted screwdriver.
- Download of the manual.
- Enjoyment of your work of course.
- 6 x IN-9 tubes (offered separately).
- A line audio source or simply use the build-in microphone.
- Dimensions (W x D x H): 135 x 95 x 160 mm incl. tubes
The word "Nixie" was formed from the words Numeric Indicator eXerimental No. 1 and first introduced 1954 by Burroughs Corporation from USA as a brand name for numeric displays. Nixie tubes were used until the mid of the 1970's as displays in measuring devices, calculators, TV sets and the very first computers. The evolution of modern style display types like Numitron, VFD, LED and LCD, which have a very low supply voltage (battery power supply) eliminated these Nixie tubes from the market, and they are not produced anymore. In the former USSR Nixie tubes were produced as surplus in vast quantities until the beginning of the 90's – and from this sources are these tubes. But even these supplies are now running short. And when they're gone, they're gone. The tubes are taken from "NOS", what means New Old Stock. They were never used before and spent their first thirty or more years forgotten in some Russian warehouse. The principle of the Nixie tubes is based on a cold cathode discharge and it is used today a million times e.g. in small neon bulbs of illuminated mains power switches.
The IN-9 Bargraph tubes in the IN-9 Nixielyzer are a special construction of such a neon bulb, it can produce a current depending variable glow hight lenght when a current regulated voltage of around 140 V is applied, and it was used in the USSR for example as a simple device to monitor the mains voltage range.
Often I was asked: "What is the lifespan of a Nixie tube" and than there is a simple answer: "Have a look at your illuminated power switch of the multiple outlet strip. How many years does this small neon bulb lights continously without any aging issues?"
The IN-9 Nixielyzer will reliable work with both types of the bargarph tubes, which are offered e.g. on Ebay. As the Argon filled tubes are actual absolutely rareon the market I offer these types of tubes together with the pre-order Nixielyzer kit including all options, exclusively on my homepage.
In the meantime I have designed with the help from Techmoan and his Patreons an alternative sketch drawing from a front plate with looks "less busier" (nearly Dieter Rams style from the 60's) and will be used for the final batch.
You can also chose between a black [SA] and silvery anodized [ME] Aluminium frame).
A great Video Review from "Techmoan" on Youtube
Backers have asked me to design an additional front cover which hides all the controls. Here's a design idea, made in Photoshop – but also easy possible in reality ;-)
This extra front cover snaps with the help of four tiny Neodymium magnets onto the haeds of the four mounting screws from the existing cover.
For this accessory and also for an assembled version of the IN-9 Nixielyzer (with Argon or Neon tubes) please visit my Homepage.
When you have already pledged for an IN-9 Nixielyzer (kit or assembled) you can order the extra front cover here.
are still available. You can rise up your pledge for 50 EUR and drop me a note that you have pledged for an assembled IN-9 Nixielyzer.
Extra front covers...
are also available. Rise up your pledge for 30 EUR and drop me also a note.
And of course, for adding 80 EUR you'll get an assembled IN-9 Nixielyzer with extra front cover.
Risks and challenges
The new IN-9 Nixielyzer is a further development and improvement of the first DIY version which is now sold out. Many customers have asked me to create a new and cheaper device.
The very first prototype PCB are arrived, so that I could build some working prototypes and take photos / videos. Thanks God ;-) there were no bigger issues as the electronics and the circuity are proven by the EM800 magilyzer and the former sold out Nixielyzer. However, as now the prototypes are finished and working reliable, the PCBs / electrical / mechanical parts needs to be ordered for a bigger batch of devices to get an affordable price.
For a "reference" see my finished project here:
- (30 days)