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I'm wondering if there is anyone out there with a definitive answer to why and/or what standard would call out the usage of the different voltage sources. There are Bars, Arrows, Dots, Waves, etc. I have in the past defined this, but I'm wondering if there are actual standards that also define it.

What I've used in the past is:

  • Wave: AC power source
  • Bar: DC Power Source (regulated)
  • Circle: DC Power source (unregulated)
  • Arrow: no idea...

If anyone has any reference to something more concrete, I would love to hear it (and bonus if there's actually reasoning to why we have so many available).

enter image description here

Update: Picture added.

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    \$\begingroup\$ Can you provide any pictures of what you're talking about? IEEE Std 91/91a, IEC 60617, and ANSI Y32.2-1975 all have their methods of keeping consistent symbol usage. \$\endgroup\$ – KingDuken Jun 6 at 16:30
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    \$\begingroup\$ This is why there are so many standards: xkcd.com/927 \$\endgroup\$ – Voltage Spike Jun 6 at 16:48
  • \$\begingroup\$ Or this std. imgs.xkcd.com/comics/circuit_diagram.png. Arrow in circle is a current source \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Jun 6 at 16:59
  • \$\begingroup\$ This is where trust issues arises from, tons of standards, if I were you I would just use either of them and then write in plain text nearby what it is. - At my university I had one teacher who preferred the bar one, another teacher who preferred the arrow, both of the teachers were talking about the exact same kind of voltage source. \$\endgroup\$ – Harry Svensson Jun 7 at 17:41
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You might want to have a look at IEEE Std 315, "Graphic Symbols for Electrical and Electronics Diagrams". Of course, this is a U.S. standard and other countries may have their own standards.

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  • \$\begingroup\$ That standard only calls out common nets (i.e. 0 Volts potential). I'm looking for DC power nets specifically... \$\endgroup\$ – Patrick Cox Jun 7 at 17:18

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