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About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

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Standardized Wiring Diagram & Schematic Symbols
April 1955 Popular Electronics

April 1955 Popular Electronics

April 1955 Popular Electronics Cover - RF CafeTable of Contents

People old and young enjoy waxing nostalgic about and learning some of the history of early electronics. Popular Electronics was published from October 1954 through April 1985. All copyrights are hereby acknowledged. See all articles from Popular Electronics.

Electronics symbols for schematics and wiring diagrams have remained amazingly consistent for the last hundred years, although obviously many new ones have been added. You can see from this set of standardized wiring diagram and schematic symbols from a 1955 edition of Popular Electronics what I mean. Even symbols for newly introduced devices tend not to change. There are some variations such as whether or not to draw a circle around a transistor or how many lightning bolt lines to use with photon emitters and detectors, but that's about it. The digital world adopted IEEE Standard 91-1984 for logic and microprocessors, although you will still occasionally see variants in symbols, especially in early digital circuit schematics.
Standardized Wiring Diagram & Schematic Symbols

Wiring Diargram Schematic Symbols from April 1955 Popular Electronics - RF Cafe

 



Posted  3/25/2012