I guess now what I would like to know are some example circuits for power supplies maybe? I guess I need 135VDC, and it needs to be isolated from the mains because it'll also have 150VAC on it relative to earth ground. Easiest to do is get a transformer (if I can find the right voltage output) but how about regulation? Is a properly sized zener diode good enough?
On Monday, October 20, 2014 10:41:47 AM UTC-5, Joe Zatarski wrote: > > So I found an elevator control panel in the garbage. They were replacing a > broken one in the dorm next to mine. It appears to have 425A5 'touch tube' > trigger tubes instead of mechanical switches. I saw an old thread here > about them which had a bit of info. I think you need to connect a 150vac > supply between ground and the cathode, then 135vdc across the anode and > cathode to use them as a touch button. There needs to be some resistance in > series with the tube of course, and the 135vdc needs to be isolated from > the ac. Also, I think the trigger input needs to be tied to the cathode > somehow. > > I still have all the wiring in the panel as it was when I found it. There > are 12 floors and a basement, so I'm thinking the buttons can represent the > hour of a clock as well as an am/pm light. Furthermore, for setting the > time, the tubes can still be used as buttons to type in the time. > > I'd appreciate if I can get some tips on driving circuitry and supplies > since these are cold cathode neon tubes, something I have never dealt with > before. > > -- 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/4399a59c-ff13-4945-8195-6e44caea789a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
