On 13-12-06 06:06 AM, Gideon Wackers wrote:
-filament resistance differs because it is cold
Filament resistance is different when cold, which is why Incandescent
Light bulbs generally fail at turn on if they are going to fail.
--
Charles MacDonald Stittsville Ontario
cm...@z
Oops. Somewhere in my wrestling with the MS Office Equation editor, I
messed the equation up. :)
V_out = (V_in*(V_out/I_L))/(R_1+(V_out/I_L))
R_1=((V_in*(V_out/I_L))/V_out)-(V_out/I_L)
On 12/6/2013 11:59 AM, Gideon Wackers wrote:
1, 5v 100ma is correct. It could be because i am viewing
Hi Gideon,
You're doing it wrong. :)
We do not normally refer to filaments by their impedance, but rather by
their power draw. What is the equivalent resistor value of a 100watt
incandescent lightbulb? There isn't one, because filaments and resistors
behave differently. For starters, a filame
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 ti
http://www.tubeclockdb.com/vfd-tubes/100-simple-vfd-tester.html
this is what I did
But I'll try it again tomorrow, maybe one of the connections was bad
because I had to hold the wires against the batteries at 4 different points
:P
Op vrijdag 6 december 2013 16:11:42 UTC+1 schreef Spencer:
>
>
Did you hook the 17.5v to the grid and segment you wanted to light up? It
should be a faint glow
Sent from my iPhone
> On Dec 6, 2013, at 5:41 AM, Gideon Wackers
> wrote:
>
> I just tried it carefully with a 1,5 volt battery, the filaments do not light
> up (good thing). but I could not get
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 t
I just tried it carefully with a 1,5 volt battery, the filaments do not
light up (good thing). but I could not get a segment to light up I only had
two 9 volt batteries and that gave me 17,5 volt which is not enough.
Btw I did notice that when I hooked up the 1,5 volt battery or took it away
t
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 fil
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
> 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 res
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