Bench Power Supply (PSU) tutorial

Apologies, this videos isn't "short" and there's much to say. Hope you'll see the (good) use of a bench power supply with this tutorial. The cheapest kind of bench PSU you can use is this 18V / 3A model : http://www.amazon.com/Tekpower-HY1803... My best bargain choice would be currently something like this: http://www.amazon.com/Mastech-Single-...