[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

On Friday, 12 April 2013 19:29:02 UTC-5, GastonP wrote: > Hi again Zitt... >All of the changes seem for good... but just for the sake of > simplicity... did you try with only a pull-up resistor to the U3A inputs to > see if you could bring the levels to CMOS ones? Actually, CMOS with 5 V >

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

Hi again Zitt... All of the changes seem for good... but just for the sake of simplicity... did you try with only a pull-up resistor to the U3A inputs to see if you could bring the levels to CMOS ones? Actually, CMOS with 5 V levels are fully compatible with TTL ones, but when one wanted to b

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

Updated schematics are posted here: http://www.Pinball-Mods.com/blogs/wp-content/uploads/2013/04/Bally7NixieFabB.pdf Fab B changes: - Changes around D[5..7]; - reworked for transistor inverters with pullu

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

On Friday, April 5, 2013 8:01:34 AM UTC-5, GastonP wrote: > Zitt, >The problem is not that it is an open drain or a CMOS (it is a CMOS and > I put it as so in my first email). The problem is that the base MPSA42 > conected directly to the output effectively shorts the output to ground > unl

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

Zitt, The problem is not that it is an open drain or a CMOS (it is a CMOS and I put it as so in my first email). The problem is that the base MPSA42 conected directly to the output effectively shorts the output to ground unless you put some resistance into that base circuit. You say you tried

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

Zitt, On Thursday, April 4, 2013 7:48:32 PM UTC-3, Zitt wrote: > > TI's data sheet says that the 503 is capable of sinking and sourcing > current: > http://www.ti.com/lit/gpn/cd4503b > and the drawing shows N and P transistors in the output. > > So the device isn't open drain. > > at 5V; the dev

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

TI's data sheet says that the 503 is capable of sinking and sourcing current: http://www.ti.com/lit/gpn/cd4503b and the drawing shows N and P transistors in the output. So the device isn't open drain. at 5V; the device can sink (low) 2.3mA typical and source 1.9mA typical (high). Even with a m

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

On Thursday, April 4, 2013 7:03:19 AM UTC-5, Terry S wrote: > The 4503 is an tri-state device -- do you need pullups on the outputs? > I can't tell from a quick glance how you are using it. How about > series resistors to the bases of the transistors? I see those on A1 > thru A4. Without some s

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

I agree with Terry, you need to put some base resistors there. Your ubiquitous 9.1K will do. Of course, test whether the 4503 and the MPSA42s are still working. CMOS logic is not output short circuit proof, nor the MPSA42 can take too much base current. Additionally, the 9.1K base resistors will

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

The 4503 is an tri-state device -- do you need pullups on the outputs? I can't tell from a quick glance how you are using it. How about series resistors to the bases of the transistors? I see those on A1 thru A4. Without some series resistance your driver can only go to .7 (Vbe) and I'm not sure ho

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

Work on the Nixie display has stalled because I can't seem to find the cause of a specific problem. Last week I put the “Tested” nixie display into my Bally Star Trek; and sadly – only digits A4-A1 work. A5, A6 won’t light. Tonight I cut the D5 trace between Q5 and U4; and hard wired from the pi

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

> Silkscreen? That looks like a protoboard. I'm unsure what U1 and U2 are > anyway, most of those supplies only use one IC (the 555). > > I was refering to the base board; not the prototype breadboard which has the > 555 timer on it.. Whoops, I misunderstood! > While at Frys today; I saw th

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

On Saturday, March 23, 2013 10:02:51 AM UTC-5, jrehwin wrote: > > > Initial debug turned up a dumb assembly mistake..– I swapped U1 & U2 > despite the clear labels on the silkscreen. > > Silkscreen? That looks like a protoboard. I'm unsure what U1 and U2 are > anyway, most of those supplies o

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

> http://forums.arcade-museum.com/showpost.php?p=2391595&postcount=43) This is a nice writeup and a good-looking project! I'm really interested, as I'm a pinball aficianado myself. I really think the 3D effect of nixies would be appealing in score displays. > Initial debug turned up a dumb as

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

(clickable links and embedded pictures at: http://forums.arcade-museum.com/showpost.php?p=2391595&postcount=43) The Mirror project was put on hold for the last three weeks... First due to the SxSw Intel LANfest I was hosting... and then Texas Pinball Festival this past weekend. Now that I had th

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

PCBs were ordered via batchpcb yesterday. so Now I play the waitin for PCB game. On Saturday, February 9, 2013 6:20:26 PM UTC-6, MrNixie (UK) wrote: > > Yes, I kinda missed the point that you were building a "drop-in" module > and would thus be limited to the signals and supplies at the connecto

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

Yes, I kinda missed the point that you were building a "drop-in" module and would thus be limited to the signals and supplies at the connectors. Well, knock one up, and see how it goes! -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscr

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

On Friday, February 8, 2013 7:22:47 AM UTC-6, jrehwin wrote: > > > You are multiplexing this display on a "one of six" basis. That means > each nixie tube is only going to see juice for maybe 15% of the time. Even > if you overdrive them, they will be on the dimmer end of their possible > ligh

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

I absolutely love that video you linked! Thanks. On Friday, 8 February 2013 15:12:21 UTC, Nixcited delighted wrote: > > On 8 Feb 2013, at 13:22, John Rehwinkel wrote: > > >> You are multiplexing this display on a "one of six" basis. That means > each nixie tube is only going to see juice for may

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

On 8 Feb 2013, at 13:22, John Rehwinkel wrote: >> You are multiplexing this display on a "one of six" basis. That means each >> nixie tube is only going to see juice for maybe 15% of the time. Even if you >> overdrive them, they will be on the dimmer end of their possible light >> output, and I

Re: [neonixie-l] Re: Nixie Pinball Display - Schematic feedback

> You are multiplexing this display on a "one of six" basis. That means each > nixie tube is only going to see juice for maybe 15% of the time. Even if you > overdrive them, they will be on the dimmer end of their possible light > output, and I would imagine that for your application nice, brig

[neonixie-l] Re: Nixie Pinball Display - Schematic feedback

Hello Zitt, first of all, this sounds like an interesting and worthwhile application for nixie tubes! You are to be congratulated on that. I am not saying your design wont work, but you've asked for comments, so here are mine... I do feel that you may have over complicated the LED drivers a li