I pulled 1 from a stereo, with the PCB and controller chip. I can't find a datasheet, but had the IC working with 5V anyways.
As for the VFD, does it really need AC on the cathode, like a heater winding for vacuum tubes ? The transformer from the stereo did have some low voltage windings, like 4Vac, or 10Vac, I have it here, but the stereo is long gone and IDK for sure what trans it was, both trans had LV windings like cathode heater level.
In an EEVblog video, Dave used AC. Then in another video a guy used 3V DC. If the filament is just a resistor, and the RMS power is the same, and the voltage is low enough relative to the anode and grid, should it be ok ?
As for the VFD, does it really need AC on the cathode, like a heater winding for vacuum tubes ? The transformer from the stereo did have some low voltage windings, like 4Vac, or 10Vac, I have it here, but the stereo is long gone and IDK for sure what trans it was, both trans had LV windings like cathode heater level.
In an EEVblog video, Dave used AC. Then in another video a guy used 3V DC. If the filament is just a resistor, and the RMS power is the same, and the voltage is low enough relative to the anode and grid, should it be ok ?