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Polarity symbols

Positive center is way more popular: gearspace.com/board/electronic-music-instruments-and-electronic-music-production/1222518-center-negative-vs-center-positive-power-supply.html
Figure 4. Source.
Figure 5. Source.

Ancestors (8)

  1. AC adapter
  2. Direct current source
  3. Direct current
  4. Alternating and direct current
  5. Electronics
  6. Area of technology
  7. Technology
  8. Home