On Wednesday, September 4, 2013 7:38:30 AM UTC-7, threeneurons wrote: > > Went to the TRW swapmeet last Saturday, where I traded with Westdave, to > get an A107 dekatron. These are in the same glass, with the same structure > as the A108 (and A109), but have a different gas mix, different operation > parameters, and the glow is barely visible, form the top. Here's a short > video: > > http://www.dailymotion.com/video/x146fbc_a107-dekatron-selector-demo_tech > > I rebuilt the selector demo circuit, with 10 LEDs in a circle. One > attached to each cathode, to show it in operation, because I had been > forewarned that the glow would be almost invisible. > > This time I left out the shunting resistors across the LEDs. In the A108 > circuit I left them in, so that only the cathode that was selected would > turn ON. But in reality, the two adjacent cathodes, also conduct some > current. In this circuit, that is shown. > > Also, here I use a neon relax oscillator with a discrete toggle flip-flop, > to step the dekatron. > > The parametric differences here, are: Supply voltage is 510V and anode > current of 1.5mA, as opposed to 300V & 0.7mA, for the A108.The commutating > step is a 120V, that's biased at 60V, so it steps down to -60V before > resting at 60V. > > > <https://lh4.googleusercontent.com/-zTbZe7MAQb0/UidFsJiQtYI/AAAAAAAAMEo/1Lix2qVC_cQ/s1600/A107_2ss.jpg> > > Enjoy ! > >
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