On 17 Jan 2014, at 17:55, John Rehwinkel wrote: >> Reading a bit more about how Gottlieb used these displays, they put the >> filament AC voltage on an 8v DC offset pedestal for the big displays and 5v >> DC for the smaller VFDs. Is this going to be necessary if I am using a 0v-5v >> AC filament that never goes negative? > > No, shouldn't be necessary. It's nice to have the filaments a little bit > positive, so grounding the anodes/grids gives a good solid turn off > (effectively, negative bias). Running them with 0-5V gives an effective > -2.5V bias, which should be sufficient (the transformer-derived AC doesn't > have that built-in bias). You can, if you want, AC couple the drive and > float it higher to reduce ghosting, but I doubt it'll be necessary. > > - John
Thank you for the detailed response John, it is much appreciated. I have ordered some MAX628CPA+ samples - they seem to be similar to the TSC428 with non-inverted/inverted outputs for the AC drive. John S -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/E1A13144-DBAF-45C5-98B4-CAA5C8F8A678%40jsdesign.co.uk. For more options, visit https://groups.google.com/groups/opt_out.
