Martin - I'm using MC14094 CMOS shift-registers to drive the NIMO grids, with a 1meg series resistor. The CMOS shift registers are driven from a 10VDC supply, so the grids are either 0V or +10V. To get proper cutoff, I drive the center-tap of the filament transformer from a buffered DAC, so I can set the bias via software control.
When the DAC is set to +6.5V, the actual voltage at the grid relative to the filament is nominally +3.5V (on) or -6.5V (off). Of course this varies due to the AC voltage across the filaments. But it averages over time and all characters have the same brightness. -- 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/935f0813-cc6f-4ef5-851a-7364d0811a93o%40googlegroups.com.
