Looking through Russian literature I can only find circuits which use the IN-9 in half-wave rectified designs for checking the mains voltage, I haven't found any circuit with any control of the signal in any other way, you can see such voltage control pens on this site: http://www.petrofflab.ru/p/blog-page_12.html but you'll have to scroll down a bit but don't skip the rest as there are many nice photos there!
The IN-13 however is always shown in circuits with some type of control with transistors or other simple designs. So I think that the IN-9 was mainly designed for simple designs with half-wave rectified voltages in mind and the IN-13 was designed with control in mind. There is even a photo of a VU-meter with IN-13 in an old Russian book. There can of course be other circuits but these designs repeat themselves across books from different writers. /Martin -- 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/d38cd738-065b-4dc5-bb6e-8455f9a14104%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
