Ahh, wondered what you meant with the first video. In my experiments I only got the A-108's to work with only one cathode on at each moment, the A-107's & A-109's would always strike two cathodes no matter how I adjusted the circuit. I'll definately have to try your circuit and see if my A-107's and A-109's behave the same. I had an almost identical circuit (as per the datasheet) but with a different flip flop and without the LEDs and also designed for higher speeds with a faster switching flip-flop. I might have done something wrong in my circuit. I didn't use a darlington pair of the MPSA42 so that might have affected the whole circuit. Thanks for showing your circuit! /Martin
On Monday, 9 September 2013 10:14:57 UTC+2, threeneurons wrote: > Oops, Actual video: > http://www.dailymotion.com/video/x14ftg4_a107-nixie-driver_tech > On Monday, September 9, 2013 1:08:22 AM UTC-7, threeneurons wrote: >> >> You mean something like this: >> http://www.dailymotion.com/threeneurons#video=x148ak5 >> >> To get rid of two adjacent transistors being on at the same time, make >> sure that only an "odd" or "even" cathode is selected alternately. After a >> lot of convoluted pondering, I went back to the something that looks like >> the original Russian drive circuit: >> >> >> <https://lh6.googleusercontent.com/-fRMqoBWKmsI/Ui2A0zX5cXI/AAAAAAAAMFI/Op7U5w_6Xms/s1600/A107_Nix_Dvr.gif> >> Get rid of all the isolating diodes, and connect the odd cathodes to one >> half, of the flip flop, and the even cathodes, to the other half. Insert >> the nixie driving transistors in each cathode leg. LEDs are also inserted >> to show the current paths. >> >> On Sunday, September 8, 2013 10:54:49 AM UTC-7, Dekatron42 wrote: >>> >>> Nice that you could adjust it to pass current on two cathodes. >>> >>> To be able to build a nice clock with these, where each cathode drive a >>> transistor which drives the Nixie, only one cathode should be struck at the >>> same time. I did not do any tests on whether this was possible with the >>> A-107 or A-109. I could only get the A-108 to strike one cathode at the >>> same time with my quick tests. Maybe some other parameter needs to be >>> adjusted for that to work, like guide bias voltage or other cathode circuit >>> load parameters. >>> >>> /Martin >>> >>> On Thursday, 5 September 2013 17:04:11 UTC+2, threeneurons wrote: >>> >>>> Here's a better video of A107 circuit: >>>> >>>> http://www.dailymotion.com/video/x148ak5_a107-selector-demo-2_tech >>>> >>>> I did add a 200K resistor in the anode leg, and adjusted it so only 2 >>>> cathodes pass current, at any time. >>>> >>> -- 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/e49a8a95-76db-4052-b3c8-182ae0a0257e%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
