Tutorial for LEDs and transistors

One of the most asked questions when I venture out to meet other Makers or folks just getting in to making things usually is – “Are there any simple how-tos that explain transistors, LEDs (Light Emitting Diode), etc..” so, here’s one I dug up from my bookmarks to check out. If you have others that we haven’t covered, post up in the comments or via our “suggest a site”. Link.