[neonixie-l] Re: Eight digit, IN-18 clock is finished

[Mitch]

Thank you. I won't be selling anything, but the files and documentation 
will be on Github, for anyone interested. 

My projects are very easy to build, otherwise I would not be able to build 
them! Some kit building experience is required. There are no instructions, 
just a schematic and BOM. That's about it unless you want to dig into the 
code. I hope that at some point, someone with real C++ experience will go 
through it and comment. As it is, it works perfectly, and bugs are 
corrected as they are found.

On Wednesday, February 24, 2016 at 7:51:24 PM UTC-5, Greg P wrote:
>
> Nice clock Mitch.  Will you be offering a kit or the PCB for sale?  I'd 
> like to get one but lack the chops for all this geek talk you guys are 
> discussing.
>
>
>
> On Wednesday, February 24, 2016 at 6:19:12 PM UTC-5, Mitch wrote:
>>
>> Thanks!
>>
>> I was not aware of that. I'm using a variety of supercaps bought from 
>> Digikey and on ebay. I didn't pay much attention to that part of the 
>> circuit or the values of the supercaps, but I was surprised to find that 
>> one clock had the correct time when not powered for about two weeks. 
>>
>>
>>
>> On Wednesday, February 24, 2016 at 3:24:26 PM UTC-5, gregebert wrote:
>>>
>>> Nice clock!
>>>
>>> Curious about the capacitor you used for sustaining the DS3231 RTC 
>>> during power-outages because there is a periodic temperature-compensation 
>>> cycle every 64 seconds that takes a spike in current. Datasheet says about 
>>> 600uA for up to 200msec, so each of those will take a bite out of your 
>>> capacitor. If I did my math correctly, a 1000uF cap will drop around 120mV 
>>> after each cycle.
>>>
>>> In my case, I was monitoring standby current of my wristwatch (nominally 
>>> < 2uA) with a 50uA mechanical meter, and the temp-comp cycle pegged the 
>>> meter.
>>>
>>>
>>>

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[neonixie-l] Re: Eight digit, IN-18 clock is finished

[Greg P]

Nice clock Mitch.  Will you be offering a kit or the PCB for sale?  I'd 
like to get one but lack the chops for all this geek talk you guys are 
discussing.



On Wednesday, February 24, 2016 at 6:19:12 PM UTC-5, Mitch wrote:
>
> Thanks!
>
> I was not aware of that. I'm using a variety of supercaps bought from 
> Digikey and on ebay. I didn't pay much attention to that part of the 
> circuit or the values of the supercaps, but I was surprised to find that 
> one clock had the correct time when not powered for about two weeks. 
>
>
>
> On Wednesday, February 24, 2016 at 3:24:26 PM UTC-5, gregebert wrote:
>>
>> Nice clock!
>>
>> Curious about the capacitor you used for sustaining the DS3231 RTC during 
>> power-outages because there is a periodic temperature-compensation cycle 
>> every 64 seconds that takes a spike in current. Datasheet says about 600uA 
>> for up to 200msec, so each of those will take a bite out of your capacitor. 
>> If I did my math correctly, a 1000uF cap will drop around 120mV after each 
>> cycle.
>>
>> In my case, I was monitoring standby current of my wristwatch (nominally 
>> < 2uA) with a 50uA mechanical meter, and the temp-comp cycle pegged the 
>> meter.
>>
>>
>>

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[neonixie-l] Re: Eight digit, IN-18 clock is finished

[Mitch]

Thanks!

I was not aware of that. I'm using a variety of supercaps bought from 
Digikey and on ebay. I didn't pay much attention to that part of the 
circuit or the values of the supercaps, but I was surprised to find that 
one clock had the correct time when not powered for about two weeks. 



On Wednesday, February 24, 2016 at 3:24:26 PM UTC-5, gregebert wrote:
>
> Nice clock!
>
> Curious about the capacitor you used for sustaining the DS3231 RTC during 
> power-outages because there is a periodic temperature-compensation cycle 
> every 64 seconds that takes a spike in current. Datasheet says about 600uA 
> for up to 200msec, so each of those will take a bite out of your capacitor. 
> If I did my math correctly, a 1000uF cap will drop around 120mV after each 
> cycle.
>
> In my case, I was monitoring standby current of my wristwatch (nominally < 
> 2uA) with a 50uA mechanical meter, and the temp-comp cycle pegged the meter.
>
>
>

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[neonixie-l] Re: Eight digit, IN-18 clock is finished

[gregebert]

Nice clock!

Curious about the capacitor you used for sustaining the DS3231 RTC during 
power-outages because there is a periodic temperature-compensation cycle 
every 64 seconds that takes a spike in current. Datasheet says about 600uA 
for up to 200msec, so each of those will take a bite out of your capacitor. 
If I did my math correctly, a 1000uF cap will drop around 120mV after each 
cycle.

In my case, I was monitoring standby current of my wristwatch (nominally < 
2uA) with a 50uA mechanical meter, and the temp-comp cycle pegged the meter.


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[neonixie-l] Re: Help with wiring for Gralex panel meter (with panaplex display)

[Gralex Ind]

Hi, 

I'm sorry for inconveniences on the website.
We have all the technical information, parts and knowledge about Gralex 
meters.
If you like contact directly the expert on this technology please use 
i...@gralexindustries.com or Ph. 203 681 9615
Thank you

Johnny Realpe
Managing Partner
Gralex Industries

On Tuesday, February 9, 2016 at 3:37:39 AM UTC-5, Paolo Cravero wrote:
>
> Hello.
> I have been given a Gralex Industries 475B-10 panel meter. It mounts a 
> Beckman SP-352 panaplex 4 digit display and I would really like to light it 
> up as-is since it even contains AC transformer.
>
> Any chance someone knows how to wire it up, and what kind of meter it is? 
> It comes from a bolometer, so most likely it is a voltage meter. 
> Unfortunately, unlikely other Gralex devices whose pictures I could locate 
> online, this unit does not carry a sticker with the pinout of the backside 
> connectors.
>
> Thanks,
> Paolo
>
>
>

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[neonixie-l] Free Shipping at Arrow electronics this week

['Dave' via neonixie-l]

Arrow is currently offering free shipping this week.
www.arrow.com
A nice deal if you need a few bits and pieces.

For example, you can get the ever popular Mill-Max mounting pins, in 250 
qty for 16 cents a pin which seems to be a good deal.
Mill Max Pins link 


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[neonixie-l] Re: Eight digit, IN-18 clock is finished

[Mitch]

Thanks. 

Yes, two extra, maybe three. You can have one for the cost of shipping. 
Please contact me off the group if you are interested.

 I'll post the code, schematic, and Diptrace files to Github, shortly. Only 
the seven digit design is there now.
Zev-2 seven digit nixie clock  

I forgot to mention that this version adds another menu to allow custom RGB 
color selection for each hour.

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Re: [neonixie-l] Eight digit, IN-18 clock is finished

[Nicholas Stock]

That is some beautiful work! Congrats.

Any spare PCB's lying around? ;-)

On Wed, Feb 24, 2016 at 5:14 AM, Mitch  wrote:

> In addition to the extra tube and assorted parts, the 7805 used with the
> seven digit clocks was swapped out for a switching supply. Now everything
> is cool to the touch except for the Taylor edge supply, which is just
> slightly warm. Also, I added a nRF24L01+ RF module and 3.3v supply for it,
> on the right side of the board, two 4 pin headers for on-board GPS, one for
> Adafruit, and one for Ublox, and another phone jack to remotely mount the
> temperature sensor.
>
> The software took much longer to develop than I had anticipated. With
> Carl's help the clock has the option to receive time from the Mod-6
> repeater, in addition to GPS and on-board RTC only options. I thought about
> having GPS and repeater fall back to each other but that didn't seem to
> make much sense, so whichever one is selected will fall back to the RTC,
> with appropriate indicators.
>
> Next I plan to design a four button remote control using ATiny or a
> similar processor, and another nRF24L01+ transciever, maybe even with some
> feedback. I'll also work on an eight digit version of the first clock that
> uses a variety of small tubes, adding RF to that one, too.
>
> After that, I'd like to switch to Atmel Studio. Without the benefit of a
> debugger, this took far longer than it would have taken, had one been
> available. At that point I want to switch to a faster, 32 bit processor, as
> long as the libraries don't cause too many compatibility issues.  The 1284P
> was easy to add, with only a crystal and a couple caps. I'm not sure if the
> 32 bit processors are as simple to integrate.
>
> That's about it.
>
>
>
> https://drive.google.com/file/d/0B3kvk05blsPJQ0ttVlA3RWI3dDg/view?usp=sharing
>
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[neonixie-l] Re: Eight digit, IN-18 clock is finished

[Mitch]

Link is a 9 second movie of the clock operating.

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