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If capacitors are just two conductive components sandwiching an insulator, then why aren't all PC board, or at least their traces, considered capacitors?

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They are, but only noticeable in very high frequencies (microwave wavelength or GHz).

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  • \$\begingroup\$ That depends on applications, some smaller frequency circuits, in boards that have high length traces should consider the capacitance of the traces. \$\endgroup\$ – Diego C Nascimento Feb 5 '14 at 4:04
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    \$\begingroup\$ If by very high frequencies you mean a few hundred kilohertz. High Trace/Bus capacitance can cause issues in even low speed 100khz i2c for example. \$\endgroup\$ – Passerby Feb 5 '14 at 4:32
  • \$\begingroup\$ On a multi-layer board, I think internal power and ground planes can have useful values of capacitance. \$\endgroup\$ – Peter Bennett Feb 5 '14 at 7:17

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