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A transistor is often described as a switch, but this is only partially true. It’s more like a valve or a faucet. If your faucet has only two choices, “on” and “off,” then it behaves as a switch, but most faucets have a range in the middle, and so do most transistors. If the range in the middle is used, we say the transistor circuit is analog. If all that’s used is “on” and “off” then it’s digital. Read the rest of this entry »

We’ve all heard the cliche that the world of electronic things is “going digital,” but what does that mean? If it’s “going digital,” where is it coming from? What it’s coming from is analog. You may be familiar with the word “analogy” meaning to explain something by comparing it to something more familiar. Analog represents the real world directly. It is continuous and interpolated. Read the rest of this entry »