Hi Nick, The IN-9 tubes are easier and cheaper to source in quantity than the IN-13. The IN-13 would otherwise be easier (much less current at the very least).
Jeremy On Sunday, September 6, 2015 at 12:12:35 AM UTC-4, Pramanicin wrote: > > Quick question for you Jeremy if I may? Why IN9's over the IN13 tubes? > > Lovely looking clock btw. > > Nick > > On Fri, Sep 4, 2015 at 09:31 Jeremy Medow <[email protected] > <javascript:>> wrote: > >> Jeremy here (the creator of this clock). I wanted to quickly address >> this: >> >> - You're definitely right about gobs of current. The tubes take around >> 12mA (at 140v striking voltage) to be fully lit. The power supply I put in >> this thing puts out around 50mA tops (it has to fit inside the clock and >> not get too hot...), so all of the animations, etc. have to keep to that >> constraint. >> >> - As for the non-linearity, the clock uses op-amp buffered npn current >> sinks for each of the digits to control the current quite tightly. The >> glow length / current for the tubes, while not *perfectly* linear, is >> certainly close enough that you can't notice in an application such as this. >> >> Let me know if you have any other questions about the operation of the >> clock - I'm happy to answer them! >> Jeremy >> >> On Thursday, September 3, 2015 at 11:55:27 AM UTC-4, gregebert wrote: >>> >>> Don't feel bad, Alex. I did some brief experimenting with IN-9 tubes and >>> found them to be non-linear, if not downright irrational, and consume gobs >>> of current considering how little light they produce. >>> >>> I used individual NE-2H bulbs for the hands on my big clock. Lots of >>> them....306 to be exact. Which also means 306 resistors, etc. Glad I did it >>> that way because it's been working great for a few years now. >>> >> -- >> 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] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/36254668-f18c-4efa-843e-53cb693bccf8%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/36254668-f18c-4efa-843e-53cb693bccf8%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> 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/1a7cbc1a-48c1-4460-acb4-58728d8f065d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
