The Nixielyzer is an analog audio spectrum analyzer, based around the BA3830S analyzer chip. It offers 6 selective audio bands: 63 Hz, 150 Hz, 330 Hz, 1 kHz, 3.3 kHz, 10 kHz and 1 channel for full audio band display.
The Nixielyzer operates with 7 x IN-13 Nixie tubes and offers stereo line in- and output (for easy daisy chaining the device within an existing audio path) with level control incl. selection of the displayed channel (right, both, left), build in microphone with an audio mixer to add the microphone signal to the display or for using the Nixielyzer as a "stand alone" device when no audio source is connected. In addition true electronic symmetrical 2 x 1/4" stereo TRS jack inputs are added. The RGB colour and brightness scale illumination can be adjusted according to your favourite colour.
A big challence was to power the Nixielyzer only from a 5 V USB power supply. Therefore the "ultra cool" HV converter design from my Nixie clocks has been used in a modified circuity. So it is possible to power up the Nixielyzer from a simple USB 1 A loader or with a Y power splitter cable (the same as most external DVD drives will use) from two USB ports of your computer.
You'll get - except of the IN-13 tubes and power supply, which is offered separate - a fully inclusive kit incl. all necessary electronical and mechanical parts (enclosure and scale) to build and power-up the device within a few hours of your evening time.
The Nixielyzer is an analogue design and uses no processor or FFT; so the display is fully in realtime.