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hantto said:Hello, I obtained these displays. What are thay called? Are they just normal LED segments? or something that requires special treatment? Any sites with info on these?
The display itself seems to be between two glass plates.
Nigel Goodwin said:hantto said:Hello, I obtained these displays. What are thay called? Are they just normal LED segments? or something that requires special treatment? Any sites with info on these?
The display itself seems to be between two glass plates.
It's a VFD (Vacuum Flourescent Display), it's not 'between two glass plates', the insides are sealed in a vacuum - it's essentially a valve (or vacuum tube, depending where you come from).
Like any valve, they require a heater supply and a fairly high HT supply (usually 60-90V), and (again like a valve) you control them by applying voltages to grids and cathodes.
crowinu said:as i told him/her, its a VFD
Nigel Goodwin said:crowinu said:as i told him/her, its a VFD
There was a large time between starting the post and finishing it, as I got called away - which is why our posts crossed over.
crowinu said:Nigel Goodwin said:crowinu said:as i told him/her, its a VFD
There was a large time between starting the post and finishing it, as I got called away - which is why our posts crossed over.
one question nigel, as far as i know VF have their own circuitry to drive no ?
Nigel Goodwin said:crowinu said:Nigel Goodwin said:crowinu said:as i told him/her, its a VFD
There was a large time between starting the post and finishing it, as I got called away - which is why our posts crossed over.
one question nigel, as far as i know VF have their own circuitry to drive no ?
I'm not quite sure what you are asking?. The display is simply a valve, and needs driving as such - usually they are fed from specifically designed micro-controllers with high voltage outputs. A common fault with them is failure of the heater supply to the VFD, often an O/C capacitor or resistor - other than that they are very reliable - although I have seen some which have gone low-emission (but never the types shown in the picture).