Source for power supply filter caps?

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  • EMT
    Member
    • Aug 2000
    • 44

    Source for power supply filter caps?

    I'm looking for recommendations for filter caps for the PSU of a small DIY amp project. Are the cheapo Xicon electrolytics okay? Need 4,700uF at around 50v or 63v. Suggested sources in the US for obtaining these caps would be helpful as well. I think Mouser and PE carry the Xicons. But don't know about other brands.
  • Hank
    Super Senior Member
    • Jul 2002
    • 1345

    #2
    I've built a few power supplies and upgraded a couple of Hafler power amp kits, but Jon is a power circuit guy, so he may have better advice. Use a low ESR electrolytic. Try the distributors that you mentioned, as well as Allied and Newark. Your post may attract some golden eared folks why might recommend some esoteric caps like Black Gate. If so, hide your wallet.

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    • JonMarsh
      Mad Max Moderator
      • Aug 2000
      • 15261

      #3
      It depends on what your circuit is like, it's bandwidth, etc. 4700 uF is somewhat small; I presume you're using them in parallel. Capacitor issues that are quite important for audio include ESR (equivalent series resistance), and ESL (equivalent series inductance), plus ripple current rating, which is dependent on ESR and capacitor area (for cooling).

      I tend to prefer the electrolytics designed for SMPS applications, as they're optimized for both ESR and ESL. You probably don't need 105C long life times, but it doesn't hurt reliability if you plan on using the gear you're building for a while.

      A good distributor for lots of electronic parts, including Panasonic caps, is Digikey; they're easy to do business with over the web, and they actually have most things in stock, unlike a lot of other distributors. I use them a lot, including for stuff at work. I use the 63V and 100V snap in PCB mount Pansonics for board mount applications. Their sefl resonance is above 100 kHz, and the work fine; for "premium applications" I like the similar CDE electrolytic caps.

      Regards,

      Jon




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      • EMT
        Member
        • Aug 2000
        • 44

        #4
        Thanks fellas. Yes, I do plan to use a couple or three of the caps in parallel. Will check the sources you mention. The circuit is from Rod Elliot's site. This is a small experimental project, just to try my hand at this kinda stuff. No fancy schmancy audiophile parts necessary At least not at first.

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