IV-18 VFD tube

Discussion in 'General Electronics Chat' started by KCHARROIS, Jun 11, 2013.

  1. KCHARROIS

    Thread Starter Member

    Jun 29, 2012
    292
    1
    Hello,

    Looking to build a clock with a IV-18 VFD tube and the datasheets dont have as much info as I'd want it to have but maybe someone in AAC might have used one or understand the VFD tubes more then I do. Anyways I understand that the filament of the VFD tube requires 5V and a nominal current of 85mA and that the grid and anode require a max of 50V with a current of 11mA as grid and 8mA at segments.

    What I dont undersand, does the filament always have 5V drop accross it there for meaning that if I have 7 volts going to it 2V will go accross a 25Ω resistor giving my current of 80mA? And same question for the grid and segments.

    Thanks
     
  2. absf

    Senior Member

    Dec 29, 2010
    1,492
    372
  3. KCHARROIS

    Thread Starter Member

    Jun 29, 2012
    292
    1
    Alright, from what I've read aslong as I stay under that 5V, I shouldn't need a resistor in series to give my 85mA. I just need a power supply that can provide 85mA.
     
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