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.
