A few months ago, in the article Transformerless PSU, is it worth it? two ways to convert AC mains into usable DC voltage were analyzed in terms of cost, space and performance.
These two types were the traditional step-down transformer approach and a transformerless design that uses the property of reactance of the capacitor to create a voltage divider and effectively step-down the voltage.
In this article, we will analyze a third way to convert AC mains into DC voltage to power small electronics. (more…)