Re: [neonixie-l] Re: IN-13 currents or Dislyxia Rides Again!!!

On 5/19/2016 6:59 PM, Joe Croft wrote: It's hell being dyslexic! I have the tubes wired backwards :( What is amazing is how they lit up and seem to work fine besides the issue of drawing 3 times as much current they should. Sigh... Off to add lots of cuts and jumpers too my board! -joe

Re: [neonixie-l] Re: IN-13 currents or Dislyxia Rides Again!!!

Joe, Don't fret too much over this. We've all been there at one time or another in our lives. Good luck, you'll get er done. Ira. On 5/19/2016 6:59 PM, Joe Croft wrote: It's hell being dyslexic! I have the tubes wired backwards :( What is amazing is how they lit up and seem to work fine

Re: [neonixie-l] Re: IN-13 currents or Dislyxia Rides Again!!!

It's hell being dyslexic! I have the tubes wired backwards :( What is amazing is how they lit up and seem to work fine besides the issue of drawing 3 times as much current they should. Sigh... Off to add lots of cuts and jumpers too my board! -joe On Thu, May 19, 2016 at 5:32 PM, Joe Croft

Re: [neonixie-l] Re: IN-13 currents

I do seem to have a problem with my board. I have pulled one of the tubes and just tried it on a bread board and life is good. Though in the board, not so good. I will have to dig harder on the layout. Something is just not right. -joe On Thu, May 19, 2016 at 2:59 PM, gregebert

Re: [neonixie-l] Re: IN-13 currents

Best thing to do is gather data for several tubes, and plot it. Inconsistent data suggests problems with the tubes; maybe they are used, out-of-spec, reject, etc units. I would use a voltmeter and measure the voltage at the following locations, while adjusting Vc to obtain (a) First speckle of

Re: [neonixie-l] Re: IN-13 currents

I'm wondering if there's something we're not seeing on the diagram which is responsible for the observations - either on it's own or in combination with the 4K7. So, short out the 4K7 - does that materially alter what you see? Second, tell us more about how Vc is generated - is it a

Re: [neonixie-l] Re: IN-13 currents

~4.5mA. Just as advertised. Just a note. These tubes do fail, in weird ways, after many hours of use. They may still glow, but it shows up at odd spots. I've noticed in the last few years, a lot of used tubes coming from Eastern Europe, being advertised as NOS. Its easy to spot with nixies and

Re: [neonixie-l] Re: IN-13 currents

Hi threeneurons, What current does your in-13 draw to get it to show fullscale? -joe On May 18, 2016 2:41 PM, "'threeneurons' via neonixie-l" < neonixie-l@googlegroups.com> wrote: > Though, the 4K7 is not needed, it does no harm. Even if the xstr had the > minimal hfe of 25, there would be less

Re: [neonixie-l] Re: IN-13 currents

Though, the 4K7 is not needed, it does no harm. Even if the xstr had the minimal hfe of 25, there would be less than a 1V drop across that resistor. I have a IN-13 running right now, on my nixie thermometer. The drawing of the pinout, is correct, from the viewed side of the tube. The aux

Re: [neonixie-l] Re: IN-13 currents

My guess is that it keeps a little pool of ionized gass at the bottom of the tube so the line will always start at the bottom. That's just my guess though. -joe On May 18, 2016 1:32 PM, "gregebert" wrote: > What purpose does the 3rd connection of the IN-13 serve ?

Re: [neonixie-l] Re: IN-13 currents

What purpose does the 3rd connection of the IN-13 serve ? According to the schematic it should be sourcing around 100uA. There is no such terminal on the IN-9; I'm wondering if the 3rd terminal results in more-stable operation ?? -- You received this message because you are subscribed to the

Re: [neonixie-l] Re: IN-13 currents

OK, that's better. Your problem is the 4K7 base resistor I think - not needed for this configuration. Base current is limited by the emitter resistor (620R). Jon. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group

Re: [neonixie-l] Re: IN-13 currents

Once more, but this time with feeling ​ On Tue, May 17, 2016 at 10:42 AM, Jon Jackson wrote: > No embedded image... > > > On Tue, May 17, 2016 at 4:40 AM, Joe Croft wrote: > >> Hi Jon, >> >> I have embedded the picture below. It's a good guess if

Re: [neonixie-l] Re: IN-13 currents

No embedded image... On Tue, May 17, 2016 at 4:40 AM, Joe Croft wrote: > Hi Jon, > > I have embedded the picture below. It's a good guess if you post the > circuit on a forum, you don't mind others re-posting it. I am definitely > using in IN-13. 3 legs vs 2, it's hard to

[neonixie-l] Re: IN-13 currents

I don't see a circuit in the link - it links on to a dead site. Can you post here? Some thoughts... Are you sure you are using IN-13 not IN-9 ? 13mA to fully light the tube is around what might be expected for a slightly cathode poisoned IN-9. It's easy to check even if the tube markings have

[neonixie-l] Re: IN-13 currents

I've briefly experimented with IN-9's, and I found them to be erratic. Other people on this group have had better results, so I would conclude there was inconsistent quality when these were manufactured. You *might* get luckier with another batch from a different seller. I,too, found that I