Re: [neonixie-l] Yet more 7441, 74141 questions
On 23 lis 2011, at 21:27, chuck richards wrote: > 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. This is not exactly an answer to your question, but -- I thought I'd share m findings. I was looking for something that would let me drive nixies through a serial interface. The best I could find was the MC33999. It won't replace the 74141s, because of 50V max output drain voltage, but it might save some circuitry if somebody wants to direct-drive nixies through a serial/SPI connection. While searching, I also found the MCP23S18 (SPI) and MCP23018 (I2C) I/O expanders, which could also be useful. You still need a driving transistor + resistor per cathode. In my current design I decided to go with 74HC595s and 74141s; with 6 nixies you still need two 16-bit chips anyway, so three 595s are not a big deal. --J. -- 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.
Re: [neonixie-l] Yet more 7441, 74141 questions
Haha! There you go again David, being all practical and realistic about things... I tend to forget that this all involves stone-age long obsolete data readout technology. :) Chuck > > > Original Message >From: dfor...@dakotacom.net >To: neonixie-l@googlegroups.com >Subject: Re: [neonixie-l] Yet more 7441, 74141 questions >Date: Wed, 23 Nov 2011 14:24:49 -0700 > >>On 11/23/2011 2:16 PM, chuck richards wrote: >>> 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 >> >>Chuck, >> >>You are correct. Nixie tubes became obsolete in 1973, so there was >no reason for >>the chip makers to develop a CMOS version of the 74141 driver chip >for them. >> >>-- >>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+unsubscr...@googlegroups.com. >>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 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.
Re: [neonixie-l] Yet more 7441, 74141 questions
Haha! There you go again David, being all practical and realistic about things... I tend to forget that this all involves stone-age long obsolete data readout technology. :) Chuck > > > Original Message >From: dfor...@dakotacom.net >To: neonixie-l@googlegroups.com >Subject: Re: [neonixie-l] Yet more 7441, 74141 questions >Date: Wed, 23 Nov 2011 14:24:49 -0700 > >>On 11/23/2011 2:16 PM, chuck richards wrote: >>> 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 >> >>Chuck, >> >>You are correct. Nixie tubes became obsolete in 1973, so there was >no reason for >>the chip makers to develop a CMOS version of the 74141 driver chip >for them. >> >>-- >>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+unsubscr...@googlegroups.com. >>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 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.
Re: [neonixie-l] Yet more 7441, 74141 questions
Haha! There you go again David, being all practical and realistic about things... I tend to forget that this all involves stone-age long obsolete data readout technology. :) Chuck > > > Original Message >From: dfor...@dakotacom.net >To: neonixie-l@googlegroups.com >Subject: Re: [neonixie-l] Yet more 7441, 74141 questions >Date: Wed, 23 Nov 2011 14:24:49 -0700 > >>On 11/23/2011 2:16 PM, chuck richards wrote: >>> 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 >> >>Chuck, >> >>You are correct. Nixie tubes became obsolete in 1973, so there was >no reason for >>the chip makers to develop a CMOS version of the 74141 driver chip >for them. >> >>-- >>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+unsubscr...@googlegroups.com. >>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 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.
Re: [neonixie-l] Yet more 7441, 74141 questions
My reason in questioning is due to the fact that the 74141 draws ~20ma. That is quite a bit of current, especially in a non-multiplexed design, if power usage is a concern. Perhaps there is a reason that you specifically need a single package solution. -Adam On 11/23/2011 1:16 PM, chuck richards wrote: 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: a...@jacobs.us To: chuc...@all2easy.net 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: a...@jacobs.us To: neonixie-l@googlegroups.com 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 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?h
RE: [neonixie-l] Yet more 7441, 74141 questions
Aren't there no suitable enhancement FET's to do the job? A HV version of the VN10 or VN (both can handle only 60 V) for instance ? eric -Original Message- From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On Behalf Of David Forbes Sent: woensdag 23 november 2011 22:25 To: neonixie-l@googlegroups.com Subject: Re: [neonixie-l] Yet more 7441, 74141 questions On 11/23/2011 2:16 PM, chuck richards wrote: > 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 Chuck, You are correct. Nixie tubes became obsolete in 1973, so there was no reason for the chip makers to develop a CMOS version of the 74141 driver chip for them. -- 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+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.
Re: [neonixie-l] Yet more 7441, 74141 questions
On 11/23/2011 2:16 PM, chuck richards wrote: 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 Chuck, You are correct. Nixie tubes became obsolete in 1973, so there was no reason for the chip makers to develop a CMOS version of the 74141 driver chip for them. -- 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+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
Re: [neonixie-l] Yet more 7441, 74141 questions
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: a...@jacobs.us >To: chuc...@all2easy.net >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: a...@jacobs.us >>>>> To: neonixie-l@googlegroups.com >>>>> 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
Re: [neonixie-l] Yet more 7441, 74141 questions
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: a...@jacobs.us To: neonixie-l@googlegroups.com 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 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. $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 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.
Re: [neonixie-l] Yet more 7441, 74141 questions
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: a...@jacobs.us To: neonixie-l@googlegroups.com 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 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. $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 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.
Re: [neonixie-l] Yet more 7441, 74141 questions
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: a...@jacobs.us >To: neonixie-l@googlegroups.com >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 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. >> >> $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 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.
Re: [neonixie-l] Yet more 7441, 74141 questions
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: a...@jacobs.us >To: neonixie-l@googlegroups.com >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 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. >> >> $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 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.
Re: [neonixie-l] Yet more 7441, 74141 questions
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 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.
[neonixie-l] Yet more 7441, 74141 questions
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 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.
[neonixie-l] Yet more 7441, 74141 questions
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 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.
