开云体育

--- In NEONIXIE-L@..., "Nick" <nick@...> wrote:

I have been quietly automatically shadowing neonixie-l since January at: - anyone can join (subject to the usual caveats to prevent spamming).

...

I will be seeking to add all the historical messages from previous years ASAP as well as mirroring the files section... Currently, nearly all of 2010 is there (over 2,300 messages, all threaded and indexed). More will come.


Nick

It's back to "normal" (at least for now). I hate it when idiots think they have to change something just to make it look more "flashy".

[Of course, I like the warm glow of a nixie tube better than the sharp, but more lifeless 7-segment LED display too.]

Not so quick, grasshopper! Before making any sort of move, I think that
we need to discuss whether we want to be at the mercy of another large
corp, in this case Google. Google is well known for dropping services
(such as Google Answers) that it doesn't like anymore. Groups could
disappear at any time.

Groups is also a spam magnet. I read somewhere (wired?) within the last
couple of days that Google has admitted the problem exists and is going
to do something about it Real Soon Now.

The alternative, and in my opinion the way to go, is to move the list to
a privately operated server such as the several that have volunteered
including myself. A private server that has been there for awhile is
not likely to go away and is probably going to be better managed. I
like the MailMan system which is why I use it for my mailing lists.

John

--
John DeArmond
Tellico Plains, Occupied TN
<-- email from here
<-- Best damned Blog on the net
PGP key: wwwkeys.pgp.net: BCB68D77

So you think it is possible to connect them via a diode (which type btw?)? That would be cool.

What I'd probably do is put a diode (the diode isn't critical, any diode that can support the voltage and current is fine since it's working with DC) and a resistor on each one. Since you're powering a nixie, it seems to me you could just double the anode resistor value (e.g. half the current) and put that resistance in series with each supply, which should give good current sharing, even if the output voltages don't match (which they won't).

What about Per's objecion that it would make one module supply the whole current?

That's why people are suggesting current sharing diodes. Several people mentioned 1k, which may or may not be sufficient. But since you have series resistance anyway (the anode resistor), the logical thing to do is make it do the current sharing as well. The larger the current sharing resistors, the more balanced the sharing will be when the voltages don't quite match. Since a large anode resistor is already part of the circuit, may as well just make it do double duty. This will give better current sharing than 1k series resistors and a shared anode resistor.

As others have pointed out, the diodes are probably unnecessary.

I'd bother the Traco engineers again about the adjustment input. Per is correct that some supplies don't like having their programming inputs tied together. Other supplies don't care. And a few can go either way, they're not happy if they're sharing a voltage divider, but if they're driven with a voltage instead, they're fine (in which case, I usually just run the voltage setting pot through an op-amp strapped as a voltage follower and drive the power supplies with that). There are other wrinkles if you want to gang-set the output voltage but have a "trim" adjustment to get multiple supplies to "track" each other nicely.

- John

--- In NEONIXIE-L@..., "Terry" <tschw10117@...> wrote:

Before YAHOO jerks us around again, let's all move over to the neonixie-L group on Google. I just looked, it looks like it would be a fairly seamless transition. All our recent messages are posted there.

Is there any reason to stay with Yahoo? Limited space for files might be an issue.

I "applied" for membership with the google group. Not sure who has to approve me.

Here's the link again.



Terry.

At the moment its just me - if AJ gives me a list of all the email addresses of the members, I'll add them in bulk. One advantage of people actually sending a membership request, is that the "dead wood" is removed - I don't actually refuse anyone (at the moment) and would really glad to have a group of people doing this ;-)

Cheers

Nick

Before YAHOO jerks us around again, let's all move over to the neonixie-L group on Google. I just looked, it looks like it would be a fairly seamless transition. All our recent messages are posted there.

Is there any reason to stay with Yahoo? Limited space for files might be an issue.

I "applied" for membership with the google group. Not sure who has to approve me.

Here's the link again.



Terry.

--- In NEONIXIE-L@..., John Rehwinkel <jrehwin@...> wrote:

So you think it is possible to connect them via a diode (which type btw?)? That would be cool.

What I'd probably do is put a diode (the diode isn't critical, any diode that can support the voltage and current is fine since it's working with DC) and a resistor on each one. Since you're powering a nixie, it seems to me you could just double the anode resistor value (e.g. half the current) and put that resistance in series with each supply, which should give good current sharing, even if the output voltages don't match (which they won't).

What about Per's objecion that it would make one module supply the whole current?

I got mine from Ebay for $40 each, retail price is shocking $378, I just got a quote but I am not going to pay this high price :-/

Good catch! Yeah, I won't be buying 'em new either! I wonder if the seller has any more.

Hmm I don't know, his name was Kory Krofft, maybe you know him?, I asked him if he had more, he said no..

Jens

So you think it is possible to connect them via a diode (which type btw?)? That would be cool.

What I'd probably do is put a diode (the diode isn't critical, any diode that can support the voltage and current is fine since it's working with DC) and a resistor on each one. Since you're powering a nixie, it seems to me you could just double the anode resistor value (e.g. half the current) and put that resistance in series with each supply, which should give good current sharing, even if the output voltages don't match (which they won't).

I got mine from Ebay for $40 each, retail price is shocking $378, I just got a quote but I am not going to pay this high price :-/

Good catch! Yeah, I won't be buying 'em new either! I wonder if the seller has any more.

- John

On 1 Sep 2010, at 12:05, fixitsan2 wrote:

There are no changes evident here too. I run two other groups and they look the same as they ever have.

Perhaps it's being done country by country, or has anyone else in the UK already experienced a change ?

Chris

Same as it ever was for me too, in the UK. What were/are they doing?

John S

--- In NEONIXIE-L@..., "per.zapro" <per.zapro@...> wrote:

--- In NEONIXIE-L@..., "jensboos" <neuss.boos@> wrote:

How about their V_adj pins? I.e. where the "programming" voltage lies. Just connect these in parallel without risk?

No, do not connect the V_adj. pins in parallel, strange things can happen.

Program them indenpently with your resistors or jumpers or whatever is used to program them.

Hmm I would like to have them be fully adjustable, that is why I have a 5K high precision pot connected to one module that I currently use. Any workaround for two? I could use a stereo pot, but they are really not precise..

Jens

On 08/31/2010 11:06 PM, NEONIXIE-L-owner@... wrote:

If an alternative to this group approved by formal or informal
consensus of the members here is underway in a timely manner, I will
happily update this group's homepage again to redirect any new
arrivals to the new alternative site.

Assuming you'll continue to moderate, I can host the list on my MailMan
system. Just say the word and I can have it set up in a few minutes.
One good thing about neon-john.com, it'll be there as long as I'm living
which will hopefully be a few more decades.

John




--
John DeArmond
Tellico Plains, Occupied TN
<-- email from here
<-- Best damned Blog on the net
PGP key: wwwkeys.pgp.net: BCB68D77

--- In NEONIXIE-L@..., "jensboos" <neuss.boos@...> wrote:

Hello folks,

I turned on my omputer today and found these mails, and I am a little surprised, my Yahoo looks the same as it has ever looked, frankly I see no difference.

But in case the "crap" returns, what should we do? The Google group from Nick seems a good option, but weren't there discussions about a "real" forum lately given all the disadvantages of mailing lists?

I think this could be the time that we settle a whole new system, i.e. a PHP based forum, they are really easy to create, the only problem is webspace.

Jens

There are no changes evident here too. I run two other groups and they look the same as they ever have.

Perhaps it's being done country by country, or has anyone else in the UK already experienced a change ?

Chris

--- In NEONIXIE-L@..., "jensboos" <neuss.boos@...> wrote:

Thanks for the enlightening words, I really appreciate it. OK so we think it is safe to connect the modules in parallel over a 1K resistor each.

Yes.

How about their V_adj pins? I.e. where the "programming" voltage lies. Just connect these in parallel without risk?

No, do not connect the V_adj. pins in parallel, strange things can happen.

Program them indenpently with your resistors or jumpers or whatever is used to program them.

// Per.

--- In NEONIXIE-L@..., "per.zapro" <per.zapro@...> wrote:

When using a resistor in series, the resistor vill act as an "elastic band", allowing the two supples to equalise out, and both supply the current needed.

// Per.

Thanks for the enlightening words, I really appreciate it. OK so we think it is safe to connect the modules in parallel over a 1K resistor each.

How about their V_adj pins? I.e. where the "programming" voltage lies. Just connect these in parallel without risk?

Jens

--- In NEONIXIE-L@..., "jensboos" <neuss.boos@...> wrote:

Hmm in parallel without diodes? I thought it would be a good idea to use a diode, because when you connect outputs of logic gates you also use diodes, I always thought that diodes are used so that no current flows "into" the output.. I am confused.

Well, a power supply won't be hurt putting a voltage equal, or lower at it's output.

Imagine a power supply module like your Traco one, placing a capacitor at it's output actually does the same - the power supply will "see" it's own voltage on it's output- but that doesn't harm anything (only in extreme cases, this can be a problem - like linear regulator e.g. 78xx series, placing a diode across Vin and Vout assures that at no time, higher voltage are on the output, than on the input - because this can hurt the regulator) Fortunatelt the Traco modules you have is completely secured, so no need to worry.

When you use diodes, you will have a voltage drop of around 0,6 volts per diode, and they will block reverse current, but the problem with diodes is, electric current takes the easiest and shortest path - so if the voltage of one of your supplies are 0,1 volts higher than the other, it will supply all the power and the other won't supply very much current. - unless you load them down pretty much, then they will share the current better, but still, one of them will be overloaded, the other not loaded so much.

When using a resistor in series, the resistor vill act as an "elastic band", allowing the two supples to equalise out, and both supply the current needed.

// Per.

--- In NEONIXIE-L@..., "per.zapro" <per.zapro@...> wrote:

Connect them in parallel with a resistor, not a diode. If the two supplies are just 0,1 volt different, and the diodes does not have the exact same voltage drop (not two one have this, they are temp. dependent too) one supply will carry all the load, not a great idea.

Hmm in parallel without diodes? I thought it would be a good idea to use a diode, because when you connect outputs of logic gates you also use diodes, I always thought that diodes are used so that no current flows "into" the output.. I am confused.

Try to wire the two supplies in parallel with a 1K resistor on both outputs.

Thanks for the tip, but I do not fully understand it, s.a.

Thanks for your help Per,
Jens

--- In NEONIXIE-L@..., "jensboos" <neuss.boos@...> wrote:

So you think it is possible to connect them via a diode (which type btw?)? That would be cool.

Connect them in parallel with a resistor, not a diode. If the two supplies are just 0,1 volt different, and the diodes does not have the exact same voltage drop (not two one have this, they are temp. dependent too) one supply will carry all the load, not a great idea.

Try to wire the two supplies in parallel with a 1K resistor on both outputs.

Strange thing they are not galvanically isolated - that is not usual TRACO style. I have a box of, maybe 30 KG's of TRACO equipment, and i don't recall a single one, not being galvanically isolated, but i guess there is exceptions.

// Per.

Brian,

You just need to locate the cookie associated with this group, save it as a
file and then tell wget to use that file with the connection. I've done it
before on various sites and it works well. You will find that if your
running FF 3 the cookies are in a sqlite database so you'll have to extract
the one you need for the list site with a bit of SQL. An easy way to dump
all the cookies is to go to
$HOME/.mozilla/firefox/<whatever-is-your-directory> and do:-

$ sqlite3 -separator ' ' cookies.sqlite 'select * from moz_cookies' >
cookies.txt

From this you can locate the specific cookie and just save it to a file that
you reference with 'wget --load-cookies filename'

Hope this helps,
Steve

On 1 September 2010 15:28, <brian@...> wrote:

I don't know what the final result of the attempts to download the forum
were from a few months ago - but if anyone managed to, I would be happy to
host them on TubeClockDB.com. I will experiment with wget...but the
authentication thing might make it challenging.

Brian

--
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once. -
Einstein


[Non-text portions of this message have been removed]

Hello folks,

I turned on my omputer today and found these mails, and I am a little surprised, my Yahoo looks the same as it has ever looked, frankly I see no difference.

But in case the "crap" returns, what should we do? The Google group from Nick seems a good option, but weren't there discussions about a "real" forum lately given all the disadvantages of mailing lists?

I think this could be the time that we settle a whole new system, i.e. a PHP based forum, they are really easy to create, the only problem is webspace.

Jens

--- In NEONIXIE-L@..., John Rehwinkel <jrehwin@...> wrote:

I think he's assuming you want to wire the outputs in series (for higher voltage) instead of parallel (for higher current). The statement would make sense for series connection.

So you think it is possible to connect them via a diode (which type btw?)? That would be cool.

I can't find any prices on their web site, do you know offhand what the retail prices are for those things? The higher voltage ones could be quite useful for dekatron and CRT projects, if they're affordable enough. I've used all but one of the nice 600V supplies I picked up on the cheap on eBay.

I got mine from Ebay for $40 each, retail price is shocking $378, I just got a quote but I am not going to pay this high price :-/

Jens