Canon 12v battery replacement 30/40d etc

[Grantj]

I made up a 12v power supply to Canon BP-511/511A to use on long exposures and save changing batteries. Comprised of cigarette lighter plug to voltage regulator to Canon BP-511 battery shell, I used it for a number of evenings and it performed perfectly, however have now sold my gear and have this left over - $60 posted australia wide