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]> 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]. > 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/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/CAOX%2BRH%2BO77LzuR%3D0xPpGrLiJ9aAxxFoZqP0OvW4VrY8G-KfPHA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
