What is the purpose of the 330ohm resistor on the +5v of the 74141? I thought maybe I've been using it wrong all along and popped open my copy of the TTL cookbook.. Nope, nothing in there about current limiting the 74141. Mike's right, give us a schematic. :)
While I was in the TTL cookbook, I happened to glance at the facing page... Has anyone ever seen a 74142? Looks like a neat chip, but I don't see any on ebay. -Adam On Tue, Jul 19, 2011 at 7:29 PM, Shane Ellis <mime...@gmail.com> wrote: > The other problem is, some of them don't display at all. I know I have the > Anode correctly connected ( I can see the ceramic insulator at the base of > the pin, inside the bottle) the only digits that light up, are 2, 3, 6, and > 7, but those should be 0, 1, 2, and 3. Pins are all connected properly to > the 74141, I checked and quadruple checked. I put a different code in > there, just to check, and same result. I suspect I have a bad ground, or > poor grounding scheme somewhere. Perhaps, something is getting too much > current? I have a 330 ohm on the +5v of the 74141, and the tube itself, has > a 10K on the anode. No other resistors or caps are in this circuit. Maybe > I got lucky last time when this worked, but this time, it's not happening. > > Shane > > > On Tue, Jul 19, 2011 at 9:12 PM, David Forbes <dfor...@dakotacom.net>wrote: > >> On 7/19/11 6:46 PM, Mimewar wrote: >> >>> OK, so I have a tube breadboarded properly, copied the circuit I built >>> last time, but the wrong numbers are being displayed. My code is good >>> ( same as on another working project) the circuit is identical, but >>> instead of a 1, I get a 3, instead of a 2, I get a 6. Any ideas? >>> Common causes? >>> Frustrated in Aurora >>> >>> Shane >>> >>> >> What are all the numbers displayed as? Then we can figure out which wires >> are swapped. >> >> >> -- >> David Forbes, Tucson AZ >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "neonixie-l" group. >> To post to this group, send an email to neonixie-l@googlegroups.com. >> To unsubscribe from this group, send email to neonixie-l+unsubscribe@** >> googlegroups.com <neonixie-l%2bunsubscr...@googlegroups.com>. >> For more options, visit this group at http://groups.google.com/** >> group/neonixie-l?hl=en-GB<http://groups.google.com/group/neonixie-l?hl=en-GB> >> . >> >> > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to neonixie-l@googlegroups.com. > To unsubscribe from this group, send email to > neonixie-l+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/neonixie-l?hl=en-GB. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
