> 1) is it possible to use a simple H bridge to provide a rough AC drive to > operate the heater? I presume originally it was spec'd for AC rather than > pulsed DC.
Yeah, works fine. H-bridge, power op amp, gate driver, whatever. You can use series resistors to adjust the current and reduce warm-up transients, and/or capacitors to limit current and float the filament to any useful voltage (I like to run it a few volts positive to get solid cut-of with a grounded grid. As it happens, two 5V H-bridges run out of phase gives an average of 2.5V, which seems to work well, and a series resistor adjusts the voltage/current as needed. - John -- 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/2479DC95-D213-4716-AF8E-2E4A2ABFA175%40mac.com. For more options, visit https://groups.google.com/d/optout.
