Hello everyone, I have just managed to acquire a set of these and would ideally like to drive them the best possible way. I had initially though about a 5V for the filament and then 24V for the cathodes and grid. The clock would only have segments activated when someone is nearby - the segments will not be left on all of the time. Now I read about A/C supply to the filaments and wonder if I should be going that way. Would anyone be able to post their findings and/or suggest the right way forward? [image: VFDsnip.JPG]
I just noted that the picture above shows the connection for the grid (pin 9 on H1) connected to 5V and not the 24V as used on the cathodes. The more I think about it - the less clear this all becomes! I need to get it right in my head before I go breaking something and then I would like to get the best possible result via reasonably straight forward means. Would anyone be able to point me in the right direction and/or share proven drive methods? - Richard On Monday, 16 September 2019 at 22:23:47 UTC+1 gregebert wrote: > Yes! That's exactly what happens. The current through the center-tap is > the sum of the anode (segment) current and the grid current. And the peak > current through the filament wires is actually *greater* than just the > current to heat the filaments. > > > *Tomasz* - As you found out, those VFDs draw a lot of current. I have a > future design for a 6-tube ILC1-1/8 (smaller tubes than the ILC1-1/7) and > I'm just going to use a high-current filament transformer with the > center-tap at GND. Grids will NOT be pure DC; closer to full-wave rectified > around 15-16V. Segment anodes will be pure DC around 36-40V with > current-regulators and non-multiplexed. > > I actually have an Op-amp summer+ADC+Software to monitor the current thru > the center-rap on my NIMO clock to determine the tube health, though it's > orders of magnitude smaller (30uA per tube). > >> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/88406a7a-3854-4dc2-bf24-8a33f769811en%40googlegroups.com.
