There are many applications for one or two transistors. These include voltage and current amplification. Described here, in part 1 of a series, is an easy to understand way of visualizing the operation of a bipolar transistor in its linear operating region.
Since last year, everybody is dreaming and talking about the Internet of Things, including myself. But that's not enough. We have reached the point where we need to go ahead and put the plans into actions.