Ahh, ok then...it appears that the answer to my previous question is that there is *not* any modern low current single-package 16-pin DIP equivalent to the old 7441 or 74141 or the russian versions of these.
That being the case, even though the old 7441/74141 draw a bit of current, they remain the simplest, one-package solution. Am I wrong here? Am I missing something? Chuck > > >---- Original Message ---- >From: [email protected] >To: [email protected] >Subject: Re: [neonixie-l] Yet more 7441, 74141 questions >Date: Wed, 23 Nov 2011 12:39:07 -0800 > >>Here's a link to a reply from David Forbes on this subject: >>http://groups.google.com/group/neonixie-l/msg/6195ec3c9b90f2ee >> >>-Adam >> >>On 11/23/2011 12:33 PM, Adam Jacobs wrote: >>> This is a question that gets asked & answered on this list >>> occasionally. I think that the simplest/easiest answer is to use >an >>> array of high voltage drivers on a BCD->Decimal IC. Turns into a >ton >>> of transistors if you are not multiplexing, though. Mike Moorrees >has >>> some much more elegant and interesting ideas in old posts on this >>> subject. Also, Supertex has a whole line of modern HV driver >chips, >>> some members of the list have spent time looking into their >suitability. >>> One nice thing to remember is that the extinguishing voltage on a >>> nixie is usually less than 50v (hence the zeners in the 74141). >Once >>> the nixie is sunk by ~50v, the nixie turns off - so the driver IC >>> doesn't have to actually since 180v. >>> >>> -Adam >>> >>> On 11/23/2011 12:27 PM, chuck richards wrote: >>>> It's a clock that I designed from scratch. >>>> Basically, it was an exercise in using (6) 74LS160 >>>> synchronous counters. It gets the HHMM set via a bank >>>> of (4) thumbwheel switches, and the SS gets zeroed out >>>> and clock stopped via another spring-return toggle switch. >>>> >>>> It worked so well that I later decided to make it into a >>>> low current version in order to be as easy on the backup >>>> battery as possible. So, I used all HC and HCT parts. >>>> >>>> I used 7441 drivers because that is what I have around here. >>>> I am not aware that any low-current versions of those >>>> drivers were ever manufactured. >>>> >>>> Indeed, *is* there any modern low-current bcd-to-decimal >>>> high voltage ic that provides a one-package 16 pin DIP >>>> solution to this requirement? Is there? Please let me >>>> know if there is. >>>> >>>> I am now making up another similar clock, but using 8422 tubes >>>> instead of 6844A kind. Just thought if I could power down >>>> the 7441/74141 ics when running on backup battery, that would >>>> save the bulk of about 60 mA. >>>> >>>> What low current drivers would you suggest? >>>> >>>> Thanks again for all of your help! >>>> You guys are a great bunch! -Chuck >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>>> >>>>> ---- Original Message ---- >>>>> From: [email protected] >>>>> To: [email protected] >>>>> Subject: RE: [POSSIBLE SPAM] Re: [neonixie-l] Yet more 7441, >74141 >>>>> questions >>>>> Date: Mon, 21 Nov 2011 13:03:23 -0800 >>>>> >>>>>> Is this a clock that was already built and you have been >modifying >>>>> for >>>>>> lower current use? or is this a clock that you designed from >the >>>>>> ground-up for low current? If it is the latter, I can't help >>>>> wondering >>>>>> why there are 74141's in there at _all_. :) >>>>>> >>>>>> -Adam >>>>>> >>>>>> On 11/21/2011 10:03 AM, chuck richards wrote: >>>>>>> In an effort to build a low-current nixie clock, >>>>>>> I tried using all 74HC parts. That works great, >>>>>>> but there are still the (6) 7441, or 74141 TTL drivers. >>>>>>> >>>>>>> How about this idea? When the clock is running on >>>>>>> the backup battery with no line power, what if 5 volts >>>>>>> Vcc were to be removed from the 7441/74141 drivers? >>>>>>> >>>>>>> That way, the clock itself would keep time, and the current >>>>>>> draw on the battery would be kept as low as possible since >>>>>>> only the CMOS ics would be running. >>>>>>> >>>>>>> Question: If the ground is kept on the 7441/74141 ics >>>>>>> and the Vcc lead is disconnected, will that cause any >>>>>>> problems for the 74HC160 counters that have their bcd outputs >>>>>>> feeding the 7441/74141 bcd inputs? >>>>>>> >>>>>>> In other words, I am concerned about the possibility of >>>>>>> the 7441/74141 having some path that would try to >>>>>>> draw excessive current from the inputs when Vcc is >>>>>>> disconnected. >>>>>>> >>>>>>> Is this a good idea to try, or is it a recipe for >>>>>>> trashing some HC160 counters? >>>>>>> >>>>>>> Thanks. Chuck >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> $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 post to this group, send an email to >[email protected]. >>>>>> To unsubscribe from this group, send email to >>>>> [email protected]. >>>>>> For more options, visit this group at >http://groups.google.com/group >>>>> /neonixie-l?hl=en-GB. >>>>>> >>>> >>>> >>>> $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 post to this group, send an email to [email protected]. >>To unsubscribe from this group, send email to >[email protected]. >>For more options, visit this group at http://groups.google.com/group >/neonixie-l?hl=en-GB. >> >> $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 post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
