The IN-9 Nixielyzer is an analog audio spectrum analyzer, based around the BA3830F 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 audio source is connected).

The IN-9 Nixielyzer operates with six IN-9 Nixie Bargraph tubess 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 dislayed dynamic range.
The topology of the electronics corresponds to that of the proven EM800 Magilyzer circuity.

• 15 VDC power supply included
• No self generated heat
• Stereo RCA in- and outputs for easy daisy chaining in an existing audio path.
• Two 1/4 TRS stereo inputs as an alternative for MP3 player, mobile phone, headphone etc.
• Selectable audio channel (right / both / left) for display.
• Build-in microphone signal can be mixed.
• 63 Hz, 150 Hz, 330 Hz, 1 kHz, 3.3 kHz and 10 kHz audio spectrum level are displayed.

What you'll need:

• 4 hour of your evening time with no hurry
• A clear, well-lit area in which to work
• Soldering station 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