A symbol is the logical representation of an electronic component on the schematic sheet. The key is to learn what is the standard practice at your company and to stick with that.Īnother important part of understanding the basics of schematic diagram symbols is to know the difference between symbols, shapes, and components. One company may encourage you to rotate a symbol on a schematic sheet while another company may not. There are many, many schematic symbols and there are also many different ways that they are represented depending on the style and needs of the user. Logic gates with pins that have a small bubble on the output pin lines indicate that its function is negated. Logic gates are represented by either a rectangle with a rounded end, or a triangle, and will have multiple lines going off the sides for pins. A resistor is a set of nine diagonal lines connected together with horizontal lines going off the sides for pins. For instance, a capacitor symbol is two vertical lines side-by-side with horizontal lines going off the sides for the pins. Symbols are drawn to be pretty simple while conveying the information of what they are and what they do. We’ll take a look at some of the basics of schematic diagram symbols here and how you can best utilize them in your designs. The real concern comes with how to work with these symbols in your schematic in order to provide the most useful information. Fortunately, the basic symbols of resistors, capacitors, and other components are pretty easy to remember and you can find them listed in many different places. This guy had a little fun at my expense, but it isn’t so fun when you don’t understand the symbols that you are working with-especially on an electronic schematic. Then he began to laugh as he pulled his hand off the chart and I realized that he had been covering up the word “Olympia” and that little blue circle was actually the letter “O.” “Airport with facilities,” “airport with lights,” I just couldn’t remember what that aggravating little blue circle was for. The guy testing me went through several different symbols which I knew, and then pointed to a light blue circle and asked me to identify it. Those charts have all kinds of different symbols on them, and you had to have them all memorized in order to pass the test. When I learned to fly I got tested on how well I could read an aeronautical chart, otherwise known as a pilot’s map.
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