How to Install Quick Connect-Terminated Capacitors?

Discussion in 'DIY' started by Luckbad, Oct 11, 2017 at 2:04 PM.

  1. Luckbad

    Luckbad Basshead - Friend

    Friend
    Joined:
    Sep 27, 2015
    Likes Received:
    1,565
    Trophy Points:
    113
    Location:
    Laguna Hills, CA
    Home Page:
    Anyone know how to install these things?

    Can you install something on the end of a wire to properly connect them?

    SFC37S30K291B-F.jpg
     

  2. Mban

    Mban Acquaintance

    Joined:
    Oct 23, 2015
    Likes Received:
    87
    Trophy Points:
    18
    Location:
    Edmonton
    Those capacitors have what are called FASTON terminals. Use something such as this attached to your wire of choice: https://www.digikey.com/product-detail/en/te-connectivity-amp-connectors/60650-1/A27652CT-ND/456743

    There are lots of choices for the FASTON terminal connectors. If you search digikey, mouser, etc. you want to look for 6.35mm (0.250") - this is the standard size that fits on the FASTONs for motor run caps, and look for a crimp one to match the wire guage that you will be using. There are both insulated and uninsulated ones (like the ones on the link I posted).

    I personally use uninsulated ones that I crimp onto the wire that I chose, then I solder the crimp portion of the terminal onto the wire, then plug it onto the FASTON terminal on the cap.

    *Edit: I can take a picture of how I have connected some of mine to an amp I've built if you'd like me to.
     
    bengo, sfoclt, Marvey and 1 other person like this.
  3. Luckbad

    Luckbad Basshead - Friend

    Friend
    Joined:
    Sep 27, 2015
    Likes Received:
    1,565
    Trophy Points:
    113
    Location:
    Laguna Hills, CA
    Home Page:
    Would be awesome to get pics. Thank you.

    So can these be easily removed after installation?

    If so, these are exactly what I'm looking for. If I'm going to be installing big motor run capacitors on the bottom of the Eddie Current Super 7, I need to be able to disconnect it without hassle if I need to work on the amp.
     
  4. Mban

    Mban Acquaintance

    Joined:
    Oct 23, 2015
    Likes Received:
    87
    Trophy Points:
    18
    Location:
    Edmonton
    Let's see if this works via phone:
    https://imgur.com/a/ySvV8

    I made holes in the chassis of my amp such that the motor runs protrude through and are secured in place using clamps which are bolted on. To disconnect the caps, you need to discharge them first with an e.g. 50k resistor that can also handle the voltage.

    Second photo shows large ceramic high voltage supply filtering resistors that I soldered directly to the FASTON connectors, which then plug onto the FASTON terminals of the caps.

    [​IMG]
     
    Luckbad likes this.
  5. Luckbad

    Luckbad Basshead - Friend

    Friend
    Joined:
    Sep 27, 2015
    Likes Received:
    1,565
    Trophy Points:
    113
    Location:
    Laguna Hills, CA
    Home Page:
    Are all of the FASTON connections identical? i.e. Can you connect to any of the 4 without issue? I assume those resistors aren't on there all the time, just for when you bleed them?
     
  6. Mban

    Mban Acquaintance

    Joined:
    Oct 23, 2015
    Likes Received:
    87
    Trophy Points:
    18
    Location:
    Edmonton
    Yup, all of the terminals are identical. They do that so you can attach multiple connections/wires to the same side of the cap. So yes, connect to any of the 4.

    Those resistors are actually part of the circuit that I have built. They connect one capacitor in the power supply to the next, thereby dropping voltage and acting to help filter the high voltage supply. It is a CRCRC design power supply section.

    A bleeder resistor is different from those I employed above, and depending on the circuit may or may not be needed directly on the cap you're thinking of putting in. Many amp designers will put in a bleeder resistor at some point within each of the high and low voltage sections of the power supply to bleed the supplies to safe levels when the amp gets turned off. Only one bleeder is usually needed for each of the supplies, but if you can't find it or don't know how to measure the bleed rate of the circuit then I would add in a bleeding resistor between the terminals of the cap. As this is a very high resistance resistor (e.g. 100k) it can stay there all the time without detriment as it bleeds current only very slowly.

    Where are you looking to employ the motor run cap in your circuit?
     
    Luckbad likes this.
  7. Luckbad

    Luckbad Basshead - Friend

    Friend
    Joined:
    Sep 27, 2015
    Likes Received:
    1,565
    Trophy Points:
    113
    Location:
    Laguna Hills, CA
    Home Page:
    They're for the feedback position.
     

Share This Page