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Why are capacitors available with values like 378 µfarad and 0.22 farad which have prime numbers like 11 and 7 in factorization instead of values like 375 µfarad and 0.2 and 0.25 farad which are nicer in factoring and addition?

What makes the manufacture of former advantageous than latter?

Dave Tweed
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Kutsit
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  • Can you give a link to a 378 uF capacitor? That's a value I've never heard of. – The Photon Mar 10 '19 at 05:02
  • https://www.petervis.com/electronics/Electrolytic_Capacitor_Values/Electrolytic_Capacitor_Values.html – Kutsit Mar 10 '19 at 05:03
  • Also: https://electronics.stackexchange.com/q/159320/6334 – The Photon Mar 10 '19 at 05:06
  • Thanks, got my answer – Kutsit Mar 10 '19 at 05:08
  • A lot of "why" questions are hard to answer because it can sometimes be an industry standard to which many people would not know about. (If you got your answer, feel free to answer your own question down in the answer box for future reference for other people with the same question... It'll also help close this question as well. Yes, you can answer your own question, that's perfectly legal on this website.) –  Mar 10 '19 at 05:10
  • @KingDuken, when the question is a duplicate of an earlier post, it doesn't make sense to self-answer. – The Photon Mar 10 '19 at 05:12
  • @ThePhoton Fair point, now I see the duplicate :) –  Mar 10 '19 at 05:14
  • Logarithmically, many of these values become uniformly spaced, ensuring the designer can find values within +-20% or +-10% or +-5% or +-1% of the ideal resistor and capacitor value. Thus AC-coupled circuits can set precise low-pass corners (such as 20,000Hz) and precise high-pass corners (such as 50Hz). – analogsystemsrf Mar 10 '19 at 14:29

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