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Thread: Capacitor Wiring

  1. #11
    Senior Member Av8r_Sed's Avatar
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    Default Re: Capacitor Wiring

    They go the first way you described, in parallel across the power and ground. If you wired it in series, all you'd get out of it would be AC and none of your electronics would work.
    -- Paul S
    Model III SN910
    582 IVO Med

  2. #12
    Senior Member GWright6970's Avatar
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    Default Re: Capacitor Wiring

    Is there are preferred "connector" or "terminal" that one uses to connect the wires to these two little metal tabs sticking out of it's top?

    Excellent thread! Thank you!
    Grover Wright
    Flying a KF IV-1200
    ROTAX 912UL

  3. #13
    Senior Member jiott's Avatar
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    Default Re: Capacitor Wiring

    I believe those small metal tabs are for a soldered connection. Don't they have a small hole in them to attach the wire before soldering?
    Jim Ott
    Portland, OR
    Kitfox SS7 flying
    Rotax 912ULS

  4. #14
    Senior Member GWright6970's Avatar
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    Default Re: Capacitor Wiring

    Jim, there are NO holes on the ends. They are just very skinny; just two tabs sticking out of the capacitor. The tab ends are pointed and slightly turned.... weird!
    Grover Wright
    Flying a KF IV-1200
    ROTAX 912UL

  5. #15
    Senior Member Av8r_Sed's Avatar
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    Default Re: Capacitor Wiring

    Grover,
    Do you have a picture and/or a manufacturer and part number for your cap?

    Edit, if it's the same cap that's pictured earlier in the thread, it's designed to be soldered into a PC board. No reason you can't solder wire to thos tabs, but I personally like the screw terminal type in this application. You're also more likely to fin mounting hardware for them.
    Last edited by Av8r_Sed; 02-07-2017 at 03:03 AM. Reason: addendum
    -- Paul S
    Model III SN910
    582 IVO Med

  6. #16
    Senior Member jrevens's Avatar
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    Default Re: Capacitor Wiring

    Hi Grover,

    I got the same type capacitor in my kit, and I believe those are solder tabs. I decided I really wanted to have screw terminals so I got a really nice one with screws and a higher voltage rating also (50 v.). Not trying to encourage anyone else to do that (spend more money when you have a perfectly good part to begin with), but that's what I did.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  7. #17
    Senior Member Esser's Avatar
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    Default Re: Capacitor Wiring

    John, where did you get your new capacitor? I want screw terminals as well.
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  8. #18
    Senior Member jrevens's Avatar
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    Default Re: Capacitor Wiring

    Quote Originally Posted by Esser View Post
    John, where did you get your new capacitor? I want screw terminals as well.
    Hi Josh,

    I bought it online from Digi-Key -
    https://www.digikey.com/products/en?...ds=493-8948-ND
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

  9. #19
    Senior Member Esser's Avatar
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    Default Re: Capacitor Wiring

    Thanks John. Interestingly, the Rotax manual recommends 22000uF for the 40A alternator too.
    ------------------
    Josh Esser
    Flying SS7
    Rotax 914iS
    AirMaster Prop

    Edmonton, AB, CWL3

  10. #20
    Senior Member jrevens's Avatar
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    Default Re: Capacitor Wiring

    I found out that Silent Hektik recommends even higher ... 33,000 uf? My capacitor is “beefier” than the original at a 50v rating, but still 22,000 uf. There may be some potential benefit to a higher micro farad rating, with no real downside. It’s still unclear to me what the capacitor actually does in this circuit. I’ve read some descriptions of that which are obviously incorrect. When I take the time to find out for sure I’ll post it on this forum. Of course there are people participating here who can probably tell all of us the real facts already.
    John Evens
    Arvada, CO
    Kitfox SS7 N27JE
    EAA Lifetime
    Chap. 43 honorary Lifetime

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