Wouldn't it be easier to make an universal transformer. I mean you make a standard with all primary and feed-back windings and make a winding for the secondary to pecifications of the tubes to use just at the moment you need it. May be even you make the secondaries in a separate chamber and keep those in stock.
eric -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of jb-electronics Sent: vrijdag 22 juli 2011 11:44 To: [email protected] Subject: [neonixie-l] Nixie Tube Power Supply: 0..300V @ 30mA max. 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.
