> I have see the LT1308B High Current, Micropower Single Cell, 600kHz DC/
> DC Converter made by Linear Tech. used in some power supply designs.
> My question is where the heck do you find a source for a step-up
> transformer for the design other than rolling your own to make a cool
> power supply for a nixie project?
For one thing, you can look at designs that use inductors instead of
transformers. Suitable inductors are much easier to find than special-purpose
transformers.
If you prefer a transformer-based design, there are a few possibilities. If
you look at some of the app notes and examples in our files sections, they'll
specify the transformer used.
Rolling your own is possible, but having a coil winder like David does helps.
Another possibility is to use the "configurable" off-the-shelf transformers.
These generally have six identical windings, which can be lashed up in various
patterns (i.e. two in parallel for the primary, four in series for the
secondary). Wurth makes 'em, and they're fairly price ($12 and up) in low
quantities. But they're available and versatile.
I buy mine from Digi-Key. If you go do a parts search on "wurth configurable",
then select "flyback" for type, "cut tape" for packaging, and tick the "in
stock" box, you'll get a listing of the ones available. These are surface
mount parts, but they're big enough to just tack leads to if you like. They
used to offer a very nice booklet ("ABC of Transformers") that was fairly
affordable and quite informative, but they've combined that with their booklet
on inductors, and another one into a nice hardbound volume "Trilogy of
Magnetics" that's a whopping 72 US dollars.
Another choice is to buy surplus inverter transformers and see if you can press
them into service. Goldmine offers this one, currently on sale for two and a
half bucks:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G13599
You can also buy strobe boards from cameras and use them. Goldmine sells one
for a buck and a half:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G17610
The strobe circuits are handy because they're compact and already assembled.
However, they tend to produce 300VDC or so. While this will give you better
current regulation for your nixies if you're using anode resistors, it will
also give lower efficiency and the little strobe inverters sometimes can't
handle the load of a nixie tube or four.
- John KG4L
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