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Electronic Engineering Info

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E Series

40% E3   10              22              47
20% E6   10      15      22      33      47      68
10% E12  10  12  15  18  22  27  33  39  47  56  68  82
 5% E24    11  13  16  20  24  30  36  43  51  62  75  91

Markup

Most characters discussed here are given with the Unicode code point, character and Vim digraph.

Standard chars used here:

  • U+0305 ◌̅ '/ overbar (NOT); vim digraph is cjs config
  • U+0047 /   slash (NOT)
  • U+0043 +   plus (OR)
  • U+2219 ∙ Sb bullet operator (AND)
  • U+2295 ⊕ 0+ circled plus (XOR); vim digraph is cjs config
  • U+2260 ≠ != not equal to

Other logic characters I've considered:

  • U+203E ‾ '- overline
  • U+2218 ∘ Ob ring operator
  • U+00AC ¬ NO logical NOT
  • U+2022 • .m bullet
  • U+00b7 · .M middle dot (latin 1)
  • U+2227 ∧ AN logical and
  • U+2228 ∨ OR logical or
  • U+22BB ⊻ logical xor

The Unicode Mathematical Operators block has more ideas.

Electronics symbols:

  • U+23DA ⏚ earth ground
  • U+238D ⎍ monostable symbol
  • U+238E ⎎ hysteresis symbol

"NOT" Signals

An active-low signal is normally indicated with bar or overline (not be confused with the shorter macron U+00AF ¯ 'm). The combining character U+305, "◌̅" or &#773, ('/ digraph in cjs Vim config) seems to work mostly ok:

  • No problem on all Unix and mobile browsers I've tried.
  • GitHub markdown is fine in normal text but for code quotes only shifts the bar to the right: C̅S̅. If it's often viewed there you might prefix an overlined space: ̅C̅S̅.
  • xterm and urxvt are fine. MinGW (Git for Windows) terminal poor rendering with most fonts, unreadable with FixedSys.
  • Stack Exchange: see rtm-overbar.

Non-combining macron characters aren't really useful because the are not complete, restricted mainly to vowels, so we have U+0100 Ā A- but not ‾B.

Various options that were considered before settling on the first two (depending on situation):

Text Code Description
C̅S̅ C̅S̅ combining overbar
/CS /CS leading slash
¬CS ¬CS leading NOT symbool
CSB CSB trailing B (for "bar") as used in MOS documentation
‾CS ‾CS leading overbar
¯CS ¯CS leading macron
CS' CS' mainly used in ASCII boolean algebra?

Overline Markup

Overline markup in other areas:

  • Unicode Combining Overline U+0305: a̅ a̅
    • Displays properly in Vim!
    • Allegedly doesn't work in some browsers, though works all I've tried.
  • HTML: <span style="text-decoration: overline">text</span>
  • LaTeX: $\overline{\mbox{<text>}}$ (mbox overrides math-mode)
  • Wikipedia: {{overline|CS}}.
  • EE StackExchange: LaTeX (SE allowed HTML does not support styles):
    • \$\small \overline{\text{CS}}\$
    • \$\small CS_{RAM}=\small A_{15}\cdot\overline{\small{A_{14}}}$