Yeah I could not see them glow in a dim lit room so :) Op vrijdag 6 december 2013 16:08:03 UTC+1 schreef nixiebunny: > > I don't know much about that tube. However, I do know: > > 1. Filaments have lower resistance when cold. > > 2. VFD filaments should not get bright enough to see clearly. A tiny > glow in a dark room, maybe. > > On 12/6/13 4:06 AM, Gideon Wackers wrote: > > I just measured the filament resistance of a IV-11 tube, according to my > > multimeter that is roughly 5-5,5 ohm (assuming it measures perfectly at > > such a low resistance). But I calculated something different; > > > > I'm going to wire the filaments of two tubes in series and feed them 5 > > volt though a resistor. So I used the voltage/resistor divider formula. > > to calculate the resistor needed for a 2 volt drop (tubes want 2*1,5V) > > and that is 10 ohms, going back to the voltage divider that gives ma a > > resistance of 15 ohms for both tubes and 7,5 ohms for each filament. > > Close you might say but still a 50% difference. > > > > Options: > > -my multimeter sucks > > -filament resistance differs because it is cold > > -both options > > -my calculations are wrong > > > > Well while I wait for an answer I'm going to build a little jig with > > lego so my tubes will be aligned perfectly straight :) > > > > -- > > 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 an email to > > [email protected]<javascript:>. > > > To view this discussion on the web, visit > > > https://groups.google.com/d/msgid/neonixie-l/4e980192-1b38-42f2-b092-9e62298f2ea3%40googlegroups.com. > > > > For more options, visit https://groups.google.com/groups/opt_out. > > > -- > David Forbes, Tucson AZ > >
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