Hi Jens, I did notmean to separate transformersm but to pre assamble the primary windings and add the secodary later. In a SMPS withvbtransformar that will be easy to do. If you want a conventional supply, may be this addres is usefull [ http://www.sauter-shop.de/assets/s2dmain.html?http://www.sauter-shop.de/ ] In the past there was a firm here in the Netherlands, that sold pre wound transformers. The primary windings where already don at the plant, so you had only to lay the secondary windings to your convenience. Especially for low voltage transformers (only a few windings) it was easy to get a custom output. My thought was to lat the primary and eventual feed-back windings in on chamber and the secondary in an other (separate) chamber.
eric -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jens Boos Sent: vrijdag 22 juli 2011 14:27 To: neonixie-l Subject: [neonixie-l] Re: Nixie Tube Power Supply: 0..300V @ 30mA max. Hi, well, I would not like to use separate transformers, I would like to keep it as flexible as possible. Joe: Well, I see that it is quite difficult, but why would a linear regulator not work fine? I could use a linear regulator with a neat heatshrink... Another thought: There are some modules by Traco (http:// www.tracopower.com/products/mhv.pdf) who do exactly what I want, e.g. the MHV12-300S10P, but I would like it to have two or three times the maximum power. It cannot be too complicated if it is available in this format, now could it? Thanks Jens On 22 Jul., 13:35, Joe Croft <[email protected]> wrote: > I always envisioned such a to be 100V to 500V and a bit beefier in > the current,somewhere between 50 and 100MA. > > Both linear regulators and voltage dividers are out of the question. > If you think about it, a linear regulator and a load is a voltage > divider, so in either case the power dissipation will be the same. > > Sadly, what you are asking for is no small cup of tea. It can be done > though it will take perseverance. Certainly more than I have. > > -joe > > On Friday 22 July 2011 05:44:12 jb-electronics wrote: > > > > > > > > > Hi folks, > > > here's that topic again, a Nixie tube power supply. > > > The background is this: I would like to build a universal power > > supply that can be used to drive all kinds of display devices: VFD > > tubes with their 50-60V anode voltage, as well as larger Nixie tubes > > with 300V anode voltage and 25mA current. > > > But it is not so easy: > > > The powre supply should be regulated from 0..300V @ 30mA max: I > > adjust a voltage, say 250V, and the supply will give me as much > > current as possible, but 30mA max. The current that actually flows > > through the tube will be adjusted with an external set of resistors. > > > Can you guys point me to the right direction? I do not quite have a > > clue of SMPS designs, all I know is that I do not want to > > electrocute myself ;-) > > > There is the alternative of a variable transformer and just > > rectifying that, but I do not like the idea of getting the current > > directly from mains without any limiting effects. > > > Another alternative might be to use the "two transformers back to back" > > idea and generate 300V DC, and then use a linear voltage regulator > > to adjust the voltage. The problem will be, though, that the > > regulator will not work in the lower voltage areas, it would have to > > dissipate 9W! This can of course be sidestepped by introducing an > > optional voltage divider, but this gets messy. Anyone know a suitable linear regulator? > > > Any other ideas are quite welcome, too. > > > Best regards, > > Jens > > > PS: I think I have sent this email twice, but at first with a wrong > > email address. Please ignore the first email ;-) -- 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. -- 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.
