http://www.tube-tester.com/sites/nixie/dat_arch/IV-11_2.pdf
IV-11 tubes use 1,5 volt for the filaments according to the datasheets I found Op vrijdag 6 december 2013 12:16:01 UTC+1 schreef Spencer: > > I used this as a reference for mine. If I remember right, it's around > 1.15volts for the filament and 100mA. So with 5v power and 2 in series, > 27ohm resistor though you want 2 watts. > > http://led.linear1.org/led.wiz > > > Sent from my iPhone > > On Dec 6, 2013, at 5:06 AM, Gideon Wackers > <[email protected]<javascript:>> > 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. > > -- 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/eac38129-f17e-4bbc-b32d-96a6371c15a8%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
