I gotcha so would this circuit work?
Sent from my iPhone > On Dec 27, 2018, at 07:32, Paul Andrews <[email protected]> wrote: > > It just shows that the 50V is relative to ground. So the 'ground' of the the > 50V supply and the ground of the rest of the circuit are tied together. > > I'm putting 'ground' in quotes, because it is really 0V. > >> On Dec 27, 2018, at 1:20 AM, Thomas Kummer <[email protected]> wrote: >> >> What does the dotted line from the ground to the 50V line mean? Did you >> short it? I bought some of these and have been studying your schematic, but >> I cant figure out what that means. >> >>> On Sunday, March 12, 2017 at 2:11:32 PM UTC-5, Paul Andrews wrote: >>> Here is a schematic. Some notes about it: The filament (aka the cathode) >>> should always have 1V across it. It has to be warm. When it is warm it has >>> a resistance of about 30R. So the purpose of the resistor network there is >>> that it cuts the 12V up into 3V, 1V and 8V (approximately). The filament is >>> raised to 3V above 0 because we need to be able to vary the grid voltage >>> from -3V to 0V with respect to the filament. So in this case, with the >>> filament held at +3V, we can vary the grid voltage from 0V to +3V. When the >>> grid is at 0V (-3V wrt to the filament), the lamp is fully off. When the >>> grid is at +3V (0V wrt the filament), the lamp is fully on. >>> >>> I made the grid voltage variable with the little resistor network off to >>> the left, just to demonstrate this. >>> >>> I created the 50V anode potential with a 200K/100K resistor network across >>> a 150V nixie power supply I happened to have. BTW, the tube will glow with >>> an anode voltage all the way down to about 23V, so 3x9V batteries in series >>> would be enough to get a glow out of it. >>> >>> In reality my 12V power supply was more like 10.5V so the resistor values I >>> used were a little different. Also, the resistance from the anode to ground >>> is not infinite, so the actual voltage of my nixie power supply was more >>> like 220V, which I produced gradually to make sure I didn't go over 50V. >>> Obviously an actual 50V power supply would be better! >>> >>> All of this is just to demonstrate the principles of the DM160, rather than >>> to act as a recipe for how they should actually be controlled! I broke two >>> lamps while experimenting, in different ways. In the first lamp I applied >>> >1V to the filament and it burned out after a few seconds!. Second, a >>> filament shorted to the grid so I couldn't control the grid voltage any >>> more. The first problem was just me being dumb. I have no idea why the >>> second problem occurred, so you have been warned! Fortunately these lamps >>> are cheap, but I am concerned that there is no apparent reason for the >>> second problem... >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "neonixie-l" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/neonixie-l/JMUjZb3iSUY/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To post to this group, send email to [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/3fbfc74c-6353-433a-b258-5d1fb8127fd3%40googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. > -- > 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 post to this group, send email to [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CABCPn3ijYYcSxQ9zGLcY6dQJVH5Q%3DEBUejp56A2kghO_xt1ouw%40mail.gmail.com. > For more options, visit https://groups.google.com/d/optout. -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/73BCAD32-D5E5-4B8C-A601-FD69D7994619%40gmail.com. For more options, visit https://groups.google.com/d/optout.
