Here's an example of a NE555 Nixie PSU with layout that shows the fat tracks on the PCB: http://bleuchez.wordpress.com/2011/09/05/a-low-cost-nixie-tube-power-supply/ (it could be made even tighter but it works). At the end of the text there are also references to a design by Nick De Smith : http://www.desmith.net/NMdS/Electronics/NixiePSU.html but that one is an SMD design and it also uses a different switching ic, but it shows the need of the fat tracks. /Martin
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