If you want to test a VFD just connect 3V over the filament. The scanntime is fast so you will not see that only one grid is activated at one time. This scann will continue untill the last grid was activated and the process will start all over again. Then it will put the first grid to 0V and got to the next grid and apply +14V. The controlling electronic will do like this: First it will put the first grid to +14V and the rest to 0V and apply +14V to the segment you want to be lighted in the first grid. The 9 rest pins are connection to the segments in the display. Each of them h as a connection out fr om the glass substrate. The voltage over the filament should be about 2-3V the current consumption is about 100mA. The two large connection at each side is the connection to the filament. I will now go on explaining how they work, then how you can build a unit to make the display come alive. Most often you will find lots of pins connected to the glass of the VFD. All you need is some power and a few circuits. It is not difficult to get such a display working. If you are lucky you find a VFD with lots of digits. As you will see, the VFD display is custom made for each purpose, so there is lot of preprinted text on the VFD like "PLAY, REC, AM, FM, VCR, START, END." and there is also some digits. There, I have found many VCR and broken stereos. Many late evenings, I usually visit the local dump station for electronic. The bars and text are flashing and running. The latest trend is to have as much effect as possible in thoose VFD. Almost every VCR use a VFD to show time and other info. This type give not so nice impression and the contrast and light is not good. Then we have the LCD type with backlight. Most common displays are LED wich gives a bright light, but can most often only show numbers, not character. I believe one can always have the use of a display. A nice looking display always impress and gives a nice light from your homebrewed project.
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