On Thursday, November 6, 2025 at 2:16:30 AM UTC-5 gregebert wrote:
I still think the capacitor coupling will work as long as you use an AC signal to modulate the Z-axis. Putting a DC level-shifter into the circuit that needs to isolate 1000 volts is going to require some very careful design. From what I can see, the time-constant for the Z-axis is pretty long (around 100msec ??), and it's very likely whatever you are displaying is much faster, so DC coupling isn't needed. I don't think I'll have an AC signal source for blanking, unless the pulsed signal qualifies. As a vector display, I'll want to blank the crt every time it moves to draw a new vector not connected to the current one. The display refresh rate is currently 60Hz, which works out to about 16.7ms for an entire screen - obliviously the blanking signal will be significantly shorter than that as there will be potentially dozens (if not hundreds) of discrete vector starting/ending points in that span. I use Proteus VSM for SPICE simulation. Given the small blocking capacitance, I suspect the RC curves will be influenced by the inherent capacitance within the crt tube itself. I'd prefer to have instantaneous on/off transitions to avoid any 'smearing' on the display. But the simplest thing is to at least test what happens when I put some signal on the blocking capacitor line to the grid... -- 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, visit https://groups.google.com/d/msgid/neonixie-l/090b1a13-bf8b-49f2-8a62-acdddbba6196n%40googlegroups.com.
