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Published on Jan 5, 2013
This is a graphic equalizer made with 10 IN9 nixie bargraphs. The circuitry consist of an analog filter PCB for each tube (visible below the tubes). These PCBs amplify and filter the audio before sending it off to the tube driver. The rest of the circuit is just a transformer and rectifier to make 180VDC and a low voltage 12V supply for the opamps in the filter. The schematic is based on this: http://www.instructables.com/id/Nixie... I only made some tweaks to a couple of component values to fit my need. As you can see, the 16KHz and the 4KHz tube are not working properly. Anyone know why the ionized gas won't "stick" to the bottom?
Yes, I know the frequency scale is in the wrong order. I noticed that *after* I have assembled all the PCBs and soldered the straight power and audio connections between them. Didn't feel like desoldering everything...