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Marconi adopted the ground plate semi-symbol, as did others. Given how closely knit and small the world of electrical technology was then, it makes perfect sense that the depictions used in patents would turn into shorthand for recognized concepts, and ultimately, pictrographic icons we know and love today.
IEEE/ANSI 315-1975 “IEEE standard for graphic symbols for electrical and electronics diagrams (including reference designation letters)” has been inactivated as of November 7, 2019, and there is no successor to that other than IEC 60617. It might be a little fastidious to care about the exact dimensions of those graphical symbols.
In this case, it is a matter of context. The symbols are denoting separate grounds, and that's where their meaning ends. It is very unlikely the power ground is tied to the chasis, and the digital ground is tied to earth. More likely, both grounds would go back to the negative terminal of the battery.
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According to him the off symbol "0" represents an uninterrupted electrical circuit (circle), that has electricity traveling from the power source through the wiring in a continuous loop Once a device's switch is turned on the electrical current flows, more or less, from the power source to the device in a straight line; which explains the "1 ...
This page provides an entire flood of symbols for specific motors. Note the use of both inductor and M-circle to address both electrical and functional symbolization in the 3-phase series motor above.
Thanks for contributing an answer to Electrical Engineering Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format ...
The following symbols are roughly ordered by decreasing voltage. Upright T, or upright lollipop (not upside-down, not on the side). Positive supply rail. Signal ground. Sensitive ground. Digital ground. Less sensitive ground. Upside-down T, or upside-down lollipop. Negative supply rail.
It's only used in this standard to indicate how big the symbols are to be drawn relative to other symbols in the standard. The (common) p-channel MOSFET with substrate internally connected doesn't appear to have a symbol in this version of the standard, i.e. the standard is lacking a p-channel version of symbol 05-05-14.
The schematic is a symbolic description of the function of an electronic circuit, while a layout diagram is a physical diagram clearly describing the location of components and nodes of the circuit. Schematics serve analysis, Layout displays function and assembly. A symbolic electrical diagram and a mechanical drawing, if you will.