Calculators for Electricity and Electronics:Schematic Symbols

Schematic symbols are drawings or pictograms used to construct a schematic diagram. Schematic diagrams are used to show how a circuit is connected. The schematic diagram is different from the actual components layout on a printed circuit board.

Breadboards are used to test a circuit design before building a printed circuit board. Current breadboards do not involve any soldering in the construction of a circuit.

Schematic Symbols

Schematic symbols are symbols used to repr – sent electrical and electronic devices in a schematic diagram for an electrical or electronic circuit. The international electrotechnical commission (iec) is responsible for keeping the symbols current, removing old symbols from use and adding new sym- bols as new technological devices emerge. These sym- bols can vary from country to country but are now, to a large extent, internationally standardized. There are several international standards for schematic symbols in schematic diagrams. Appendix 13—Digital Logic

Weatherproof duplex receptacle

uses American (MIL/ANSI) symbols for schematic diagrams.

Different symbols may be used depending on the use of the drawing. For example, electrical symbols used in architectural drawings (Figure 5-1) are different from symbols used in schematic diagram electronics (Figure 5-2). In wiring a house, look for symbols prominent in house wiring. Any electrical fixture found in a house has a symbol that coincides to it on an electrical drawing (Figure 5-3). These drawings al- low an electrical contractor to easily read the diagram during the construction phase.

Schematic symbols are followed with a reference designator that identifies a component in an electri- cal schematic diagram or on a printed circuit board (PCB). The reference designator usually consists of one or two letters followed by a subscript number, for example, R2, C1, S4, IR1, and so on. Reference designa-

tors followed by a subscript number and letter indicate

a component with several sections tied to a common point, for example, S1 , R2 , and so forth.

Some of the more common electronic components and reference designators used by industry are shown

introduction to basic electricity and electronics technology-0021

1. Why are schematic symbols used in the electrical and electronic field?

2. Why is there more than one schematic symbol for a device?

3. Is there a difference between schematic sym- bols used for electrical wiring diagrams and those used for electronic schematic diagram symbols?

4. What is the function of a reference designator?

5. What do letters following a component number in a reference designator signify?

 

Leave a comment

Your email address will not be published. Required fields are marked *