Joe, One possible solution (and not a very politically-correct one either) would be to loose the multiplexing. Run them with straight DC. Keep them on all the time. No noise that way.
Just a suggestion which I know works because that's how I run my 16-tube B-7971 text-scrolling array here. Straight DC. 240 tube segments. No flicker. No noise. No ghosting. Chuck > > >---- Original Message ---- >From: [email protected] >To: [email protected] >Subject: RE: [neonixie-l] Multiplexing noise >Date: Sun, 22 Feb 2015 10:17:22 -0600 > >>Hi Yall, >> >>I am working on a multiplexed display and am finding that for the >lines >>that have both of their transistors turned off, there are massive >swings of >>voltage that are induced on the lines. The levels are so high I get >other >>digits flickering in the tube and I also have neon bulbs that are >attached >>get lit up. >> >>I've read several things about this being due to timing, but this is >not >>the case (at least for the neon bulbs) I know this because the >'other pin', >>the pin that should not light up, is the pin that gets lit up. >> >>I had an engineer tell me that ground plains will help isolate these >to >>some degree, are there any other ideas? I am using MPSA42 and MPSA92 >>transistors for driving the tubes and lamps. >> >>Any ideas will be appreciated. >> >>-joe >> >>-- >>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/CAE%2BVk6P-qH8gAaAFmCbdp >P9atnTOfBkJ9n%3DQ%2B4TbZkP4iGRVNQ%40mail.gmail.com. >>For more options, visit https://groups.google.com/d/optout. >> $4.95/mo. National Dialup, Anti-Spam, Anti-Virus, 5mb personal web space. 5x faster dialup for only $9.95/mo. No contracts, No fees, No Kidding! See http://www.All2Easy.net for more details! -- 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/380-220152022173652739%40all2easy.net. For more options, visit https://groups.google.com/d/optout.
