Re: [neonixie-l] Re: Welcome & please introduce yourself!

[Bill Notfaded]

Thanks Nick I really appreciate it

Bill

On Sat, Mar 9, 2019, 3:08 PM Nicholas Stock  wrote:

> Welcome aboard Bill!
>
> Nick
>
> Sent from my iPhone
>
> On Mar 8, 2019, at 11:30, Bill Notfaded  wrote:
>
> My name's Bill aka as the notfaded1, computer scientist, interested in all
> things retro and pre current technological age.  I have a few nixie clocks
> and recently I've been getting into IN-18 and B-7971 bulbs.  I recently
> acquired a Mod-Six V2 clock with GPS repeater and and the polished base.  I
> have some additional 7971's and am planning a new TES SmartSocket clock as
> well.  I want to use a Raspberry Pi3 to drive the clock and word display
> functions so it can interface to wifi and the internet.  If all goes well
> I'm hoping I'll have an 8 character display depending on the tubes I have.
> I'll post some pictures soon.  I'm excited to see there are a lot of long
> time members of this group and many that go back to when it was hosted on
> Yahoo.  I'm guessing I've finally come to the right place to where others,
> like me, have been permanently bit by the nixie bug.
>
> I live in Scottsdale Arizona in the valley of the sun.
>
> Best Regards,
>
> Bill
>
>
> On Wednesday, September 19, 2018 at 8:03:23 AM UTC-7, neonixie-l wrote:
>>
>> Ladies & Gentlemen,,,
>>
>> We are getting a steady stream of new members - it'd be great if, instead
>> of just lurking, you could introduce yourselves with a bit of detail about
>> your interests, what you've built or intend to build/dream of building.
>> Even what gets you up the morning and makes you smile!
>>
>> Even existing members (there are over 1,000) could chip in - there's some
>> great stuff around...
>>
>> Welcome, one and all to this great community!
>>
>> Nick
>>
>>
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Re: [neonixie-l] Re: Welcome & please introduce yourself!

[Nicholas Stock]

Welcome aboard Bill!

Nick

Sent from my iPhone

> On Mar 8, 2019, at 11:30, Bill Notfaded  wrote:
> 
> My name's Bill aka as the notfaded1, computer scientist, interested in all 
> things retro and pre current technological age.  I have a few nixie clocks 
> and recently I've been getting into IN-18 and B-7971 bulbs.  I recently 
> acquired a Mod-Six V2 clock with GPS repeater and and the polished base.  I 
> have some additional 7971's and am planning a new TES SmartSocket clock as 
> well.  I want to use a Raspberry Pi3 to drive the clock and word display 
> functions so it can interface to wifi and the internet.  If all goes well I'm 
> hoping I'll have an 8 character display depending on the tubes I have.  I'll 
> post some pictures soon.  I'm excited to see there are a lot of long time 
> members of this group and many that go back to when it was hosted on Yahoo.  
> I'm guessing I've finally come to the right place to where others, like me, 
> have been permanently bit by the nixie bug.
> 
> I live in Scottsdale Arizona in the valley of the sun.
> 
> Best Regards,
> 
> Bill
> 
> 
>> On Wednesday, September 19, 2018 at 8:03:23 AM UTC-7, neonixie-l wrote:
>> Ladies & Gentlemen,,,
>> 
>> We are getting a steady stream of new members - it'd be great if, instead of 
>> just lurking, you could introduce yourselves with a bit of detail about your 
>> interests, what you've built or intend to build/dream of building. Even what 
>> gets you up the morning and makes you smile!
>> 
>> Even existing members (there are over 1,000) could chip in - there's some 
>> great stuff around...
>> 
>> Welcome, one and all to this great community!
>> 
>> Nick
>> 
>> 
> 
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[neonixie-l] Re: Push-pull driving cathodes

[newxito]

 

I was using the good old MC34063 on all my boards but I just did a test 
with the LT3757 (already mentioned in this group) using the high voltage 
flyback power supply datasheet schematic with a DA2032 transformer. I’m 
really impressed, 170V up to 69mA at 12V with around 86% efficiency, just a 
bit warm, no audible noise. 

I’m not an electronic engineer, I don’t really know what I’m doing :-) So, 
I’m sure that with a correct board design the efficiency could be improved.

 

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Re: [neonixie-l] Push-pull driving cathodes

[David Pye]

Yep.  A lot of designs just use individual HV transistors for each cathode.

I recommend mpsa42 personally as they are ideal for cathode driving and not
expensive.

They come in several different packages including sot23 SMD if you need
small..

David

On Sat, 9 Mar 2019, 15:31 Jasper C.,  wrote:

> I was planning to not multiplex my nixies, probably leaving all cathodes
>> connected directly to the HV line, and placing current liming resistors on
>> the cathodes.  Was interested to see if I'd need to tweak any of the
>> individual resistor values uniform current/brightness.
>>
>
> I only just reread what I wrote there, and realise I made a typo.  I
> should have said I was going to connect all the anodes to the HV line...
>
>
> On Thursday, 7 March 2019 00:41:00 UTC+8, nixiebunny wrote:
>>
>> Another important fact about Nixie tube cathodes: turning on one cathode
>> by pulling it to zero volts causes it to steer all the available current
>> away from the other cathodes, causing them to be dark. This is why you only
>> need a 50V switch on each cathode.
>> The caveat is that if no cathodes are pulled to zero volts, then there
>> will be leakage current flowing through the tube that will destroy a 50V
>> transistor. This is why I used the TD62083 with its set of commutation
>> diodes, and connected the diode common anode pin to a 50V source in my
>> Nixie watch circuit.
>> It's also why I made the blanking mode that drops the anode voltage to
>> 100V, so that the cathodes all remain dark when blanked.
>>
>>
> Ah, well that comes back to the page I referenced in the opening:
> http://www.decodesystems.com/re-how-nixies-work.html.  Maybe that was
> written in reference to having leaky cathode transistors? (With no voltage
> clamp, as in Fig. 4.)  If I had say 300V+ transistors with sufficiently low
> leakage when off (< 10 uA) and a 170V power supply, would I be able to
> blank the tube safely by turning all transistors off?
>
> I'll have another look at power supplies. :)  I was a little concerned
> about how to calculate the value of the loop compensation components.  For
> my first attempt I figured I'd avoid the problem altogether by using one of
> Yan's power supplies, and focus on the segment driving circuitry.
>
>
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RE: [neonixie-l] Re: How dangerous is 150V - 170V DC?

[johnk]

I was involved in the testing of Residual Current Detector designs in the ‘90s. 
I know that you are discussing the DC at present but you guys also play with AC.

When it comes to a shock the path of the current is very important.

Research the topic a bit. AC and DC.  It is surprisingly complex.

 

While you are at it look up what this guy did…

https://ethw.org/Oral-History:Gottfried_Biegelmeier

 

>From the RCD era I have his papers somewhere AND a video of him him a bathtub 
>electrocuting himself –well, shocking anyway for you purists.

I wonder if it is on youtube or the web somewhere?

 

HMM, start with this one.

  
https://www.youtube.com/watch?v=08r27LnLHCM

 

 

And because we are discussing shocks… I must take this chance [as always] to 
say that Edison was a lout and should have been electrocuted.

For the elephant, let alone the rest of his atrocities.

 

 

John K

Australia

From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
Behalf Of Bill Notfaded
Sent: Saturday, 9 March 2019 01:23
To: neonixie-l
Subject: [neonixie-l] Re: How dangerous is 150V - 170V DC?

 

I think Eric aka Tidak hit the nail on the head... it's not so much the voltage 
as the amperage that kills you.  I=V/R  You can plug the variables into ohm's 
law and figure it out pretty easily.  With high resistance even 170V doesn't 
equal many amps.  I think it's all about potentially how many electrons can 
flow (voltage) and how easily they are flowing (resistance).

On Friday, February 1, 2019 at 1:19:42 AM UTC-7, Thomas Kummer wrote:

I’m very reckless when it comes to my Nixie projects. I’ve shocked myself with 
150 - 170V DC more times than I care to admit, and every time I’ve done it, the 
shock isn’t that bad. However, every time I’ve done it, my hands have been dry, 
and there’s been a series resistor somewhere in the circuit. I’ve been tazed 
before, and the Nixie 150-170V is no where near as bad. Is it the resistors 
that have saved me, and I should thank my lucky stars that they were there? Or, 
is it the fact that 150-170V DC isn’t as dangerous as everyone makes it out to 
be? I mean either way I know I should be more careful. I guess what I’m getting 
at is what are the chances of me accidentally doing any significant  harm to 
myself from a Nixie project? 

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