All of my PIC programming is in C or Pascal. Sorry, no assembler. On Friday, September 7, 2012 11:04:47 AM UTC-4, Bill v wrote: > > Hi Ron, > > > > Providing the MPSA transistor is OK, it should work. There is one thought > I have, since the bulbs require very little current to glow, could it be > there is enough parasitic capacity in your wiring or circuit board to make > them light? What if you were (for a test) to place a resistor of say 1 meg > across the bulb and see what happens? It just may bleed off enough current > to turn them off. > > > > I have also a selfish question. I see you are using a PIC and a DS1302 > RTC. I happen to be working on a design (16 segment VFD) using the same > parts. Do you program your PIC in assembly or something else? I use > assembly, and if by chance you do also, I would be very grateful for a copy > of the code section dealing with the DS1302. > > > > Thanks, > > Bill van Dijk > > > > *From:* neoni...@googlegroups.com <javascript:> [mailto: > neoni...@googlegroups.com <javascript:>] *On Behalf Of *Ron Schuster > *Sent:* Friday, September 07, 2012 10:39 AM > *To:* neoni...@googlegroups.com <javascript:> > *Subject:* [neonixie-l] NE-2 lamps not fully blanking > > > > I've built a 4-digit IN-17 nixie clock based on a 1x4 mux design. It uses > 4 neon lamps, 2 for the colon, 1 for the PM indicator and 1 for the Alarm > On indicator. I have a small problem where I see a dim flicker in the lamps > that are supposed to be off. They are driven as part of the nixie > multiplexing circuit. One side of each lamp is tied to one of the digit > anode drivers. The other sides are tied together and pulled to ground > through one common MPSA42 "cathode" driver. I think I have sufficient > blanking time between the digits. Each digit is on for 1 ms and the > blanking time between digits is 100 uSec. The nixies are showing no > ghosting at all. Any help in figuring out why my lamps are not turning > fully off would be greatly appreciated. Schematics are attached. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to neoni...@googlegroups.com<javascript:> > . > To unsubscribe from this group, send email to > neonixie-l+...@googlegroups.com <javascript:>. > To view this discussion on the web, visit > https://groups.google.com/d/msg/neonixie-l/-/RssVX0Tgn2kJ. > For more options, visit https://groups.google.com/groups/opt_out. > > > ------------------------------ > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2197 / Virus Database: 2437/5254 - Release Date: 09/07/12 >
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