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Unexpected VFD behaviour

Discussion in 'General Electronics Chat' started by throbscottle, Jul 12, 2018 at 11:37 AM.

  1. throbscottle

    throbscottle Well-Known Member

    Feb 1, 2012
    Nuneaton, Warwickshire, UK
    Vacuum Fluorescent Display, not the other kind of VFD!
    Anyway, I was experimenting with VFD filament drive based on this article: http://www.kerrywong.com/2013/06/05/vfd-filament-driver-using-555/comment-page-1/ and trying out different sizes of ferrite core (yes, very tedious), I'd found one where it was coming on but still needing a bigger core.

    Most unexpected was the segments being lit more brightly at the ends of the display than in the middle! I suppose this makes interesting evidence of the filament resistance affecting brightness, even with AC drive.

    I suppose the effect just disappears when adequate filament drive is used, but I thought it worth commenting on :)

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