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Re: 14-/16-segment LED's with magnifying cupole and NO ascii rom?
"samwibatt"
Do you mean displays like this:
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I found those on eBay a few years back, not sure if there's any reliable supply of them to be found. As I recall they're multiplexed and have no character ROM. --- In NEONIXIE-L@..., "marta_kson" <marta_kson@...> wrote:
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Re: 14-/16-segment LED's with magnifying cupole and NO ascii rom?
Steven Arangolord
--- On Thu, 7/29/10, marta_kson <marta_kson@...> wrote:
Have there ever been manufacured any 14- or 16-segment miniature alphanumeric LED displays with magnifier cupole that does not have an integrated ASCII-ROM? IMHO one of the most fascinating LED's ever made, but all I know of have that limiting factor with the damn character generator that can not be bypassed. --- I do not know the part numbers, but I used to work on some control units 28 years ago that used Hewlett-Packard 4 digit displays like this. We could strobe the data into them to light any pixel combination possible in 5 x 7 dot format. They were the case footprint of a typical 14 pin DIP case IC. 听 Steve in Fullerton, Calif. [Non-text portions of this message have been removed] |
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14-/16-segment LED's with magnifying cupole and NO ascii rom?
"marta_kson"
Have there ever been manufacured any 14- or 16-segment miniature alphanumeric LED displays with magnifier cupole that does not have an integrated ASCII-ROM?
IMHO one of the most fascinating LED's ever made, but all I know of have that limiting factor with the damn character generator that can not be bypassed. |
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Re: Nice & Compact Nixie Tube Multimeter?
"Tidak Ada"
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-----Original Message-----
From: NEONIXIE-L@... On Behalf Of jensboos I was wondering - since my 5EUR quick'n'dirty multimeter is no longer working satisfactory - if it was time to invest some money in a decent Nixie tube multimeter. By decent I mean that it can actually measure voltage, current, resistance, capacitance and inductivity. And it should be compact. I have found a nearly perfect model here: But sadly the auction is already over and this model does not support capacitance & inductivity measurement. Can some of you recommend a specific model? ------------------------------------ Hallo Jens, The combination CVM plus C and L measurement will bw hard to find in a nixie modell. In that time LC meters where separate instruments. I think you can better look for a nice Digital Multimeter (Volts/Amps/Ohms) and eiter a LCR bridge or a digital LCR meter. May me you can find on at a ham fest. Hier die Terminenkalender f眉r Hamfests in Deutschland, Belgien, Niederlande und Frankreich: [ ] (Deutsche sprache) The VOM, you missed looks a nice instrument from a well known manufacturer. eric Yahoo! Groups Links |
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Nice & Compact Nixie Tube Multimeter?
"jensboos"
Hello folks,
I was wondering - since my 5EUR quick'n'dirty multimeter is no longer working satisfactory - if it was time to invest some money in a decent Nixie tube multimeter. By decent I mean that it can actually measure voltage, current, resistance, capacitance and inductivity. And it should be compact. I have found a nearly perfect model here: But sadly the auction is already over and this model does not support capacitance & inductivity measurement. Can some of you recommend a specific model? Looking forward to your replies, all the ebst, Jens |
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Maxim1771 SMPS Limits
"quicklynamed"
Hello,
I'm a noob to SMPS (really IC's in general) but have long been a hi-fi and valve guitar amp hobbyist. I've been doing my best to comprehend the Max1771 (), but it's a steep learning curve (not to mention one of the most involved data sheets I've come across). What I'm trying to understand is if I could safely run Nick DeSmith's circuit (see links-->power supplies--->SMPS or desmith.net) at up to 400v, 60-70ma or more? I'm tired of ordering one-off transformers for prototypes and would love to be able to build a HV SMPS so I can simply adjust the output for a particular design. Do I understand correctly that the Max1771's output abilities are simply dependent on the specs of the passive components, diode, inductor, etc? Sorry if this has been addressed--I've tried my best to scroll through old threads. Thanks for your help (and a big thanks to Nick DeSmith for getting me interested enough to sign up at this forum). Eric |
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Re: The future of the hobby?
"g7pkf"
Due to items going out of production many years ago i forcast prices going up at a rate of knots once the russian stocks are diminished.
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I expect we will all be looking for rare "led" displays in 10 years time and in 5 flourescent. --- In NEONIXIE-L@..., "cagamba" <cagamba@...> wrote:
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Re: To use an external RTC or not?
Kuriloff
On Jul 29, 2010, at 6:32 AM, "yhbcoggs" <rdcjr@...> wrote:
You can achieve the same accuracy as a TXCO (2ppm / 1minute/yr ) w/just an xtal-controlled microcontroller and a thermistor; But you'd spend more time getting that code to work. It still doesn't solve accuracy over power loss unless your micro has a super-low power mode and you implement your TXCO software which will add more coding time.How does the TXCO compare to the old way of using the 60 Hz signal off of mains. My understanding from prior posts is that the power grids monitor this and adjust the frequency over 24 hrs to keep clock on time. Over a week, a month, a year, how does the deviation compare to a crystal oscillator even with temperature and aging compensation? Even a WWVB or satellite signal needs an internal clock for periods of poor reception and lack of receiver lock. Until there is a synch the clock may be a few seconds off. This may be no better on a given day than either of the above time keeping solutions. A person with more than one clock never really knows what time it is. Sent from iPhone off & running |
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Re: To use an external RTC or not?
"yhbcoggs"
You can achieve the same accuracy as a TXCO (2ppm / 1minute/yr ) w/just an xtal-controlled microcontroller and a thermistor; But you'd spend more time getting that code to work. It still doesn't solve accuracy over power loss unless your micro has a super-low power mode and you implement your TXCO software which will add more coding time.
Tradeoff is the DS3231 is almost $7, more than may microcontrollers ! You can also just use a conventional NV Clock like the DS1202 and a 32khz crystal (and battery or supercap), but this won't be anywhere near as accurate across power failures. Short answer - Most people are using TXCOs these days. |
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Re: To use an external RTC or not?
Quixotic Nixotic
On 28 Jul 2010, at 02:52, DanielK wrote:
I have noticed that some designers use an Atmel microprocessor with an external RTC and TXO, others use an Atmel microprocessor with an integral crystal (surface mount), and still others like Moses use a Microprocessor without an external RTC but with an external TXO.I usually use a DS3231 in my new designs as it is compensated for ageing and temperature, does leap years, has 2 alarms etc. And it's easy to hang a supercap off it for battery backup. For internal microprocessor generated timing I have successfully used PICs and Bresenham's algorithm. There is lots of information here: <> (scroll down - on my screen there is a big gap between the first picture and the rest of the page which you may miss) John S |
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Re: The future of the hobby?
honeyjukes@...
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-----Original Message-----
From: "jensboos" <neuss.boos@...> --- In NEONIXIE-L@..., "cagamba" <cagamba@...> wrote: Just a few questions, what's in your neon crystal ball?Oh I do not think it is a boring question. I think the main problem will be to "pass on the t[ube]" to the next generation. I am only 20 years of age, so this is somewhat unusual, most people I talk with here at the university are into weird stuff, too, but only one person had actually heard of Nixie tubes before because his father had brought home such a clock once. Hmm, sure, the tubes will become more expensive, I mean we can see it everyday, 40EUR for a new IN-18? That is ridiculous. When I bought mine in 2006 they were still at 20EUR a piece.. But I severely doubt that it will stay like this. Any market crashes from time to time if the goods become too expensive. Ironically, the rare tubes will probably surface continuously over the next decade. The problem is with the "normal" tubes, these resources might dry out (not the Russian tubes, but the American and European tubes). ----- Interesting that you are 20 Jens... My eldest son who is 19 has some friends who think our Nixie clock is 'uber-retro', especially as it sits on my tube amp! One of his friends even recognised what type of Nixies are used as well as the KT88's in the amp. Like some obsolete NOS 6973's these prices will probably rise as extinction looms but as long as there is a demand a manufacturer will make the tube. This might push the hobby beyond the reach of most mere mortals in the long term, but as long as there is a hard-core following those cold cathodes will continue to light our darkness. Martin Sent from my BlackBerry� wireless device |
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Re: The future of the hobby?
"jensboos"
--- In NEONIXIE-L@..., "cagamba" <cagamba@...> wrote:
Oh I do not think it is a boring question. I think the main problem will be to "pass on the t[ube]" to the next generation. I am only 20 years of age, so this is somewhat unusual, most people I talk with here at the university are into weird stuff, too, but only one person had actually heard of Nixie tubes before because his father had brought home such a clock once. Hmm, sure, the tubes will become more expensive, I mean we can see it everyday, 40EUR for a new IN-18? That is ridiculous. When I bought mine in 2006 they were still at 20EUR a piece.. But I severely doubt that it will stay like this. Any market crashes from time to time if the goods become too expensive. Ironically, the rare tubes will probably surface continuously over the next decade. The problem is with the "normal" tubes, these resources might dry out (not the Russian tubes, but the American and European tubes). Jens |
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Re: To use an external RTC or not?
Adam Jacobs
On Tue, Jul 27, 2010 at 6:52 PM, DanielK <kuriloff@...> wrote:
I have noticed that some designers use an Atmel microprocessor with anHi Dan, Firstly: I'm sure that Moses has a clock function running on a timer interrupt. These are very easy to implement, and there are lots of examples online. It is generally advantageous to use an external crystal, since the built-in oscillator on the AVR chips is not really accurate enough for this purpose. A temperature compensated crystal will be more accurate than a standard crystal and generally requires no calibration. As for a RTC chip, these have their place too, although I tend to only bother with them if I also need to keep track of the date for some reason. Otherwise, I think they are more hassle than they are worth, since the ones I have used are interfaced via i2c and require all of the i2c interface code be added to the project. -Adam |
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The future of the hobby?
"cagamba"
What do you think will be the future of this hobby? Some thoughts: Do you think it will stay pretty much the same or will things change a lot? Prices of tubes, will they go up or down? Any new developments, useful chips, things becoming easier? New ways of doing things? Shortage of important parts such as ICs? Tubes in extinction? A lot of people joining the crowd? Other uses besides (mainly) clocks? Some unexpected flood of NOS IN-18 tubes on the market, bringing prices down to 3 dollars apiece? LOL
Just a few questions, what's in your neon crystal ball? Marco (yeah, bored) |
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To use an external RTC or not?
"DanielK"
I have noticed that some designers use an Atmel microprocessor with an external RTC and TXO, others use an Atmel microprocessor with an integral crystal (surface mount), and still others like Moses use a Microprocessor without an external RTC but with an external TXO.
What are the advantages or disadvantages of these different appoaches. I am not sure how Moses gets the clock function from his microprocessor without a RTC. Dan |
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Tayloredge smart sockets and CD4511
"DanielK"
I think I found a possible solution to take full advantage of all of the features of the Moses (Neonixie) 6 digit driver with the B7971s.
Replace the six 74141s with six CD4511 BCD to seven segment decoder driver, then interface these with the Tayloredge smart sockets which have all of the HV MPSA 42 driver transistors with the base and collector transistors organized on the board. I would replace the PIC on the board with the CD4511s. Please look at the schematic for the sockets and let me know if this would make sense to use for the Moses driver solution. Take a look at this socket: I uploaded to schematics for the socket and for the allspectrum CPU |
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