On 21.10.13 18:00, Dave Cole wrote: > The 24 volt transformers are called commonly called Buck/Boost transformers. > > Oftentimes used to boost 208 to 240 volts or buck 240 down to 208.. > > http://en.wikipedia.org/wiki/Buck%E2%80%93boost_transformer
Wiring the secondary of any step-down transformer in series with the primary, phased either for step-up or step-down, forms an autotransformer: http://en.wikipedia.org/wiki/Autotransformer Now we have no isolation from the supply side. When I did that to use a European 220v router on Aussie 240v mains, I just grabbed a suitable transformer from the junk box. Its secondary current rating exceeded the router's consumption, and had a secondary voltage of 24v, giving a choice of 216v or 264v. More recently, about twenty turns of insulated wire added to a toroidal power transformer tweaked the secondary voltage to provide what I needed, while leaving it as a step-down transformer with full isolation. Erik -- The Kyoto Protocol, drafted in 1997, aimed to reduce the world's greenhouse gas emissions by around five per cent from 1990 levels by the end of 2012. Instead, global greenhouse gases have risen around 58 per cent in that time. - http://www.abc.net.au/news/2012-12-08/troubled-un-climate-talks-spill-over/4416696 ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
