Re: [neonixie-l] 1961 Heathkit Catalog

[Mac Doktor]

> On May 6, 2020, at 12:21 PM, John Snow  wrote:
> 
> I take it you you a flux pen or something to add additional solder? That must 
> have dried up by now


I've got two half spools of Ersin Multicore from around 1985 and they still 
have plenty of flux. I purchased my Weller WTCP-N around the same time and I've 
replaced the tip once.

I also have brand new spool of Kester 44 but it's only been twenty years since 
I bought it. I guess I'll start using it when I use the other two up.


Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com/

“The book said something astonishing, a very big thought.
It said that the stars were suns, only very far away.
The Sun was a star, but close up.”—Carl Sagan, Cosmos, 1980


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Re: [neonixie-l] 1961 Heathkit Catalog

[John Snow]

I take it you you a flux pen or something to add additional solder? That 
must have dried up by now

On Sunday, 3 May 2020 16:25:29 UTC+1, martin martin wrote:
>
> I use a 40 year old spool of Kester 44. 0.31 dia, flux core 58
>
>
>
> ~
> *mcve...@gmail.com *
>
>
> On Sun, May 3, 2020 at 7:54 AM alb.001 alb.001  > wrote:
>
>> good for you fixing a vintage microwave.   Mine is also an oldie - an 
>> engagement gift pre 1986.  All of a sudden the timer countdown works but no 
>> microwaves being generated.   I asked a friend who told me to check all the 
>> micro-switches and sure enough they were all heavily pitted from arcing. I 
>> replaced them all and used silver solder to fix them.   Still works 
>> great.   Knowing soldering saved my old stuff many a time. 
>>
>> Pharma Phil  
>>
>> -- Original Message -- 
>> From: Instrument Resources of America > 
>>
>> Date: May 3, 2020 at 2:31 AM 
>>
>> I had to repair my 45 plus year old Sharp kitchen microwave oven just 
>> last week. A relay's coil terminal, solder joint on the PCB was completely 
>> cracked all the way around the pin. Re-soldered it and works just like new. 
>> I chalked it up to the constant vibration of the door being shut. Ira.
>>
>> On 5/2/2020 3:24 PM, ' jf...@my-deja.com ' via neonixie-l 
>> wrote: 
>>
>> It was meant as a joke. I still use SnPb eutectic solder, and I think my 
>> ~1 kg is a lifetime supply I think I can blame this for my dumbness, since 
>> I used to hold the solder in my teeth during construction and repair. 
>>
>> I have this religious belief, scientifically not proven, that Pb-free 
>> solder made some of the surface-mount boards in my car less reliable. There 
>> were some medium-power current-limiting resistors where one of the solder 
>> joints eventually cracked ad left an open circuit. I blame this on the ROHS 
>> solder being more brittle and the thermal cycling eventually fatiguing and 
>> cracking the solder after 5-10 years. 
>>
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[neonixie-l] Re: Eight digit B7971 Clock

[Mitch]

Thanks! Boards and programmed microcontrollers will be available from me, 
full kits elsewhere.

Documentation is at angryelectrons.co, in the downloads section. The 
assembly manual isn't finished yet. Operations manual is the same for all 
word clocks.

The board behind the clock is the six digit version. I don't have enough 
tubes to run both without decommissioning one of two other B7971 clocks 
that I have. I may just do that.



On Tuesday, May 5, 2020 at 11:24:16 AM UTC-4, Mitch wrote:
>
> Finished. No cut traces, no jumpers, and no bugs reported so far. It runs 
> the same firmware as all of my word clocks, Nixie and LED.
>

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Re: [neonixie-l] A different kind of neon tube

[Kevin A.]

Terry,

Yes and yes.

If this project generates enough interest, we can get a quantity discount
from LND. LND does offer significant quantity discounts, based on numbers I
got during a recent request for quote.
There are also talks of designing the electronics to be compatible with
different tubes, including the popular SBM-20 and Si-29, which can be had
for a much lower cost at the expense of having no alpha window.

Carl and I are actively experimenting with mechanical details as well.
There is a fine balance between maintaining good sensitivity and protecting
the tube, including the delicate alpha window for the 712 specifically.

I'll provide updates over the next few weeks as I get the tools I need to
begin cutting. Current ideas I have include:

- drilling a lot of small holes in the plastic tube around the bottom and
sides of the GM tube area. I plan to start at around 50% open area and
empirically gauge the balance between GM tube sensitivity and mechanical
strength.
- milling wide longitudinal slots along the GM tube area, which will then
be covered with #20 stainless mesh (52% open area) . This will include a
mesh covered hole at the bottom for the alpha window.

The end product is intended for use with the electronics and GM tube fully
enclosed and seated in the plastic tube. The rotary encoder knob will
protrude from the end cap as the user interface.
Also in the works are ways to make the USB connector accessible without
having to open the tube. This connector is primarily for charging, but the
ability to collect data logs and perform firmware updates are also planned.





On Tue, May 5, 2020 at 8:20 PM Mac Doktor  wrote:

>
> On Apr 30, 2020, at 9:02 PM, Kevin A. 
> wrote:
>
> This is pocket sized geiger counter designed by Mr. Henry Carl Ott, also a
> member of the list here. Turns out the GM tube in this project uses neon
> too!
>
>
> Interesting build. LND-712s are (or were) $72 apiece and their minimum
> order is something like $99. If these are going to be for sale will there
> be tubes available in singles?
>
> Also, will the finished version have some sort of enclosure to protect the
> alpha window? I'm assuming that the plastic tube in the picture is for
> storage only.
>
>
> Terry Bowman, KA4HJH
> "The Mac Doctor"
>
> https://www.astarcloseup.com/
>
> “The book said something astonishing, a very big thought.
> It said that the stars were suns, only very far away.
> The Sun was a star, but close up.”—Carl Sagan, *Cosmos*, 1980
>
>
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> 
> .
>

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