I have multiple projects with Nixies, the spectrum analyzer is the first one and it will be followed by a PC monitor (CPU and MEM). Rectified DC sounds like a better option in terms of results but I think it's too bulky; I found a schematic with rectified DC + uplifting diode bridge but I didn't consider it yet. When I will build the PC monitor I will definitely need something small to fit on the back of a PC bay panel (the plastic bay on the front of the PC case). I also built a spectrum analyzer schematic based on a MCU but that wasn't successful at all; I jumped too soon into building it and I don't think it was well thought, well designed or even built. I was enticed by the idea of having an MCU doing a FFT rather than separate active filters for each band. The beauty of the MCU schematic was that it was scalable so, in theory, you could attach 10-20 tubes with no issue. I can share the schematic if you want. Can someone still tell me what should be the parameters of the low-pass filter on the driver stage?
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