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Looking for a 'smooth' bargraph...

Discussion in 'Electronic Components' started by james, Aug 23, 2003.

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  1. james

    james Guest

    I'm trying to find a 'LED' 'BarGraph' that does not use discrete leds/dots
    (ex.: a stack of 100 leds, or an LCD). I saw these used on a few hi-end
    mixers (recording studios). They look like glowing thermometers (as in the
    mercury would glow bright green or red) and respond at about 5-20hz
    (minimum).

    I've been serching the net to locate this component, but so far I've turned
    up empty handed. Probably because I dont know the name that is used to
    designate theses 'bar graphs'.

    Does any one here know where I could find this? Or, at least what are they
    called???

    Thank you,
    -Jason
     
  2. Brian Aase

    Brian Aase Guest

    These are probably the "Self-Scan" displays originally made by
    Burroughs, and still sold by Vishay/Dale. They look *really* great
    but the drive circuitry is fairly complicated (more so than just a
    big ladder of comparators, for example). I haven't priced them
    recently, but prepare to spend lots of money. You may also have
    trouble finding a Vishay distributor who will order them for you.
    I have some old info... if you want copies, email me and I'll try to
    dig it up.

    brian dot aase at verizon dot net


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  3. Dan Barlow

    Dan Barlow Guest

    I haven't seen those in LED, but there are neon ones with continuous
    discharge length controlled by the current. KWTubes was selling them
    on eBay a while back (doesn't have any now.)

    Also you can look for Magic Eye tubes for a similar effect.
    -Dan Barlow
     
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