That's a WE346 with the paint removed from the glass. Its a gas trigger tube: http://www.westernelectric.com/spec_sheets/346C.pdf
Here's the internal structure: <https://lh6.googleusercontent.com/--BSwCmzGee8/UiiIu82GTJI/AAAAAAAAME4/VeohzTppOiI/s1600/WE346_2s.jpg> Its driven by a simplier circuit, that later used to run this neon flower: http://www.dailymotion.com/video/x2fz6o_neon-flowers_creation Basically, I change the duty cycle on each half of the tube. The WE346 has that anode rod, with a half circle cathode, and trigger electrode is identical to the cathode. So, I treat it like an additional cathode. On the flower, there's only two electrodes, so I drive that from an H-bridge. Each electrode alternates being an anode, then cathode. The effect happens by sweeping the duty cycle of each electrode (in its cathode period) between 10% to 90%, over a period of ~2 seconds. A small AVR tiny12 uC is involved. Same with the WE346, but there I don't need an H-bridge, since I have the dedicated anode. Just two NPNs. One for each cathode. On Thursday, September 5, 2013 5:51:55 AM UTC-7, jrehwin wrote: > > > > http://www.dailymotion.com/video/x146fbc_a107-dekatron-selector-demo_tech > > I saw another video titled "Abba Zabba Inside a Pile of Tubes", and am > trying to figure out what the large neon? tube is that seems to have the > glow darken on alternate sides, mounted on a circular base divided into > quadrants. > > > http://www.dailymotion.com/video/x13sg67_abba-zabba-inside-a-pile-of-tubes_tech > > > - John > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/00b5992d-6463-4759-96b2-90075d4bb71e%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
