I think that the best thing you can do is to ask the company who replaced it if they can help you with any schematics, otherwise you will have to draw one yourself from what you have left of the elevator panel and we can take it from there, then you will know what voltages you need and you can do some experiments more easily.
/Martin On Tuesday, 21 October 2014 21:00:47 UTC+2, Joe Zatarski wrote: > > 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/d05c13da-523f-4cb6-b69a-6066faed0e5c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
