Hey Grahame thanks for those links especially the GE manual, just what I need to brush up on my theory.
As a point of (possible) discussion there is one thing I totally disliked. Upon first linking to the site 'Scribd' I/we are greeted with a message: "You Must be Logged in to Download a Document...Login with Facebook". Okay thinks I, logging in with Facebook AND giving away all my details, allowing Scribd access to my profile , my friends profiles, allowing Scribd to post on my wall...allowing Scribd access to my wife, to sacrifice my first born etc only to be confronted with a message when attempting to download....nope you can't have this unless you pay us money! Okay you only need pay a small sum for one days access or month/yearly or upload something (How much? For 'upload credits'?) It is still con trick afaiak, if you have to pay a fee then they should say so upfront NOT after I have given away MY details and all the permissions for facebook etc (which is worth money in its self but I did not charge for!). Let's face it we're already the 'product' not the consumer being on facebook to start with but I am against any site that is not upfront with any fees that may need paying and especially when greeted with such an opening message! I now have to delve into FB to delete those permissions given. As an aside there are of course 'ways and means' around it like a greasemonkey script or youtube for instance more than likely posted by people also peeved into sharing their details with nothing in return. Had I been informed from the start that a small fee is payable I would have gladly paid for such an informative (electronic pdf copy of) book. Anyone have any thoughts on this or the like? On 18 Feb, 12:04, Grahame Marsh <[email protected]> wrote: > I just posted a link to Acton & Swift > > Neale is here (download a pdf and read online) > :http://www.archive.org/details/ColdCathodeTubeCircuitDesign > > Glowlamp manual is > here:http://www.scribd.com/doc/34672942/General-Electric-Glow-Lamp-Manual-... > > Any more links folks? > > On the yahoo site we had a book/magazine section - how can that best be > arranged with google? > > Grahame > > On 18/02/2012 11:47, Dekatron42 wrote: > > > > > > > > > Michel, have you read the books: > > > Cold Cathode Discharge Tubes by Acton& Swift > > Cold Cathode Tube Circuit Design by D M Neale > > Glimmr hren und Kaltkatoden-Relaisr hren by Otto Paul Herrnkind > > Glowlamp Manual by General Electric > > Kaltkatodenrelaisr hren Dekadenz hlr hren by DR Roland H bner > > Kaltkatodenr hren by Greiff > > Electronic Counting Circuits Techniques& Devices by MULLARD > > Ziffernanzieger hren by VALVO > > > There is a lot about what happens inside a cold cathode tube in those > > books with explanations about charge, deionization and stuff - way > > above my head but it gave me a good ground to stand on when trying to > > understand more about what happens inside these tubes, and it was > > enough for me to understand it at a basic level. > > > There are of course many more books that describe these phenomena, but > > those are the ones that I have borrowed from libraries and looked > > into. > > > /Martin > > > On 18 Feb, 11:56, Cobra007<[email protected]> wrote: > >> I think you're right and that would explain why I can't really measure > >> the capacitive component. You're talking about negative resistance, I > >> had not looked at it that way but it sounds very reasonable, the > >> voltage over the tube will decay while the resistance increases so > >> that would indeed be negative. > > >> I do indeed use a pulse with series resistor, I let the voltage drop > >> from say 150V down to say 100V to turn the tube off. Normally, with a > >> capacitive load, the tube's cathode would then immediately drop to > >> -50V. This doesn't happen, it doesn't even go below 0V most likely > >> because the negative resistance wins over the capacitive properties. > > >> I think the inductive component is very small. At some frequency it > >> should resonate I would assume but I can't see that in my step > >> response so the inductance must be very very small. > > >> Michel > > >> On Feb 18, 1:51 am, John Rehwinkel<[email protected]> wrote: > > >>>> How does a nixie behave in the first few hundred micro seconds after > >>>> switching off. Is it resistive, capacitive or inductive? I would > >>>> assume it to be capacitive but that is not exactly what I measure. > >>> That's a really good question, and I'll admit I haven't attempted to > >>> measure it. So, in the grand tradition, I'll take a guess at it. Said > >>> guess is that the plasma stays ionized for a bit before the atoms settle > >>> back down to ground state, so it would have the electrical properties of > >>> an ionized plasma, which would be: negative resistance. This would decay > >>> to capacitance as the gas became nonconductive. there's of course > >>> inductance from the leads, and the capacitance and inductance are > >>> distributed (especially in larger nixies), making a sort of sloppy > >>> transmission line with varying characteristics. Now I want to see if > >>> various nixies have resonant frequencies, and what I'd get back if I > >>> hooked a TDR to a really big one. > >>>> It > >>>> seems more resistive, so I am wondering if this is normal or am I > >>>> doing something wrong? > >>> I'm curious as to how you're measuring this in the first place. Are you > >>> using pulses with a trailing voltage and a series resistance, or what? > >>> - John- D lj citerad text - > >> - Visa citerad text - -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
