> * by useful i mean something you could use for a purpose and not just a > construction to decorate a shelf. >
You mean functioning ? I have a tube project, in the queue, that's visual, so its decorative, yet the tubes are functioning as designed. Its a tube color organ. I've been bothered about the old SCR based color organ circuit that's been floating around since the 60's. It has NO true amplitude-to-phase-angle control. I actually make a TRIAC kit, that does the job properly, and I plan to make a tube version shortly. It will be using both vacuum tubes, and thyratrons. Here's a timing diagram showing true phase control for TRIACs: <https://threeneurons.files.wordpress.com/2015/07/timing_as.gif> It will utilize single vacuum triode stages as voltage comparators, much like I'm doing here, with a transistor: <https://threeneurons.files.wordpress.com/2015/07/xstr_cmp.gif> And here's an old tube color organ kit, that does NOT have decent phase control, even though the author believes it does, and is probably the bad example that continued over to solid state SCRs: https://threeneurons.files.wordpress.com/2017/11/radio-news_color-organ.pdf -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/603cdeb8-55ca-4d0c-b50b-a4c772b074c6%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
