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At a higher level of abstraction, the familiar symbol(s) with the letter "M" in a circular enclosure are commonplace, such as the brushless and brushed motor symbols illustrated in the question. At a more pedantic level, some schematics use the M-circle symbol with a variety of enhancements to specify the various types of motors.
This is a less common symbol. Below are the more common ones, European on the left, American on the right. Compare to the symbol for a non-polarized capacitor: Note: I think the American symbol for a non-polarized cap is a bad one; it suggests that there is some kind of asymmetry where in reality there isn't one. edit
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 ...
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 (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. As stefanct points out in a comment below, this list is just a list of examples of how standard's elements are to be combined, so the non-listed ...
This from IEEE Std 315 for that symbol: "A conducting connection to a chassis or frame, or equivalent chassis connection of a printed-wiring board. The chassis or frame (or equivalent chassis connection of a printed-wiring board) may be at substantial potential with respect to the earth or structure in which this chassis or frame (or printed ...
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 ...
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 ...
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 bar symbol is analog ground (in this case). The triangle stands for analog ground. The lollipop is the Vdd supply rail. However, this does not follow the normal schematic convention. That's why that notation is confusing, and we have to tilt our heads and guess from the context. Standard convention