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Help with 1st wind: Split Coil Precision Pickup

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  • Help with 1st wind: Split Coil Precision Pickup

    Taken from the Seymour Duncan website:
    "Leo’s split pickup was made with one coil magnetized South and the other coil magnetized North. One coil was wound Clockwise and the other wound Counter-Clockwise with both coils were hooked up in series to each other. The combination of opposite magnetic fields and coil direction produced a humbucking effect."

    Can you get the same result by reversing connection instead of winding CW/CCW?
    Is it better to ground the start or finish?

    Lucas

  • #2
    I have 3 bobbins with A5 rods from Mojo. I was going to wind one to 10k turns, one 5% under and the last one 5% over. I found a document on this site with a vintage fender spec of 10k with A2 rods. That said, would 10k on A5 rods be too over the top? What could I expect? Would fewer turns be recommended? Say 9k and +/-5%?

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    • #3
      I have wound them different ways.
      The last one I did I wound both coils the same direction.
      tied the starts together and hooked up the other 2.
      On the 10k over and under 5%, I liked the less better than the more.
      The more got too dark or muddy for my taste, especially on the bass side bobbin.

      Good Luck,
      T
      "If Hitler invaded Hell, I would make at least a favourable reference of the Devil in the House of Commons." Winston Churchill
      Terry

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      • #4
        So, used one finish for the output, one finish to ground, and the two starts together? That effectively reverses the winding direction of one coil then, right?
        Thinking maybe 9k, 9k5, and 10k.

        Comment


        • #5
          Originally posted by Lucas View Post
          So, used one finish for the output, one finish to ground, and the two starts together? That effectively reverses the winding direction of one coil then, right?
          Thinking maybe 9k, 9k5, and 10k.
          Yes, I used the bass bobbin finish for output, and the treble finish to ground.
          Be sure one bobbin is north up and the other is south up.
          You may prefer 9.5, 10, and 10.5k for your choices.
          9k may be a little low.
          I wound them up to 11k but getting in the too dark for my taste.
          T
          "If Hitler invaded Hell, I would make at least a favourable reference of the Devil in the House of Commons." Winston Churchill
          Terry

          Comment


          • #6
            On a P Bass pickup you don't really care if the two halves of the pickup are in phase or not. All you care about is that you cancel the noise out. You can wind both the same direction or not.
            Now if you're going to combine that P with a J you need to think that through if you want all 4 string in phase across both pickups.

            Comment


            • #7
              Originally posted by David King View Post
              On a P Bass pickup you don't really care if the two halves of the pickup are in phase or not. All you care about is that you cancel the noise out. You can wind both the same direction or not.
              Now if you're going to combine that P with a J you need to think that through if you want all 4 string in phase across both pickups.
              The humbucker in the bridge solves the J problem.
              Never did understand why the mix with the single coil J got so popular?
              "If Hitler invaded Hell, I would make at least a favourable reference of the Devil in the House of Commons." Winston Churchill
              Terry

              Comment


              • #8
                Originally posted by David King View Post
                On a P Bass pickup you don't really care if the two halves of the pickup are in phase or not. All you care about is that you cancel the noise out. You can wind both the same direction or not.
                Now if you're going to combine that P with a J you need to think that through if you want all 4 string in phase across both pickups.
                So winding direction or reversing connection has nothing to do with hum canceling?
                Yes, I do need to consider combining with a J. Thanks.

                Comment


                • #9
                  Originally posted by Lucas View Post
                  Can you get the same result by reversing connection instead of winding CW/CCW?
                  Yes.

                  Is it better to ground the start or finish?
                  On the bobbin under the E and A strings, ground the start. That will prevent noise when you touch the magnets.
                  It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein


                  http://coneyislandguitars.com
                  www.soundcloud.com/davidravenmoon

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                  • #10
                    Originally posted by David King View Post
                    On a P Bass pickup you don't really care if the two halves of the pickup are in phase or not. All you care about is that you cancel the noise out. You can wind both the same direction or not.
                    Now if you're going to combine that P with a J you need to think that through if you want all 4 string in phase across both pickups.
                    This is why you want to reverse the electrical polarity of one coil, or reverse the winding direction. Then both halves are in phase. You can do it the other way, and even make it work with same polarity magnets, but that's a bad joke to play on someone down the road if they decide to add a bridge pickup.
                    It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein


                    http://coneyislandguitars.com
                    www.soundcloud.com/davidravenmoon

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                    • #11
                      Originally posted by David Schwab View Post
                      This is why you want to reverse the electrical polarity of one coil, or reverse the winding direction. Then both halves are in phase. You can do it the other way, and even make it work with same polarity magnets, but that's a bad joke to play on someone down the road if they decide to add a bridge pickup.
                      so then a split P is connected differently when in a PJ setup? They are wired in phase with each other and the J bridge pup is wired out of phase. When Split P by itself, each coil is wired out of phase, or CW/CCW direction.

                      Comment


                      • #12
                        Lucas,
                        That would be the ideal configuration. Not sure how the switching would go for that but it shouldn't be hard to figure out for a 3 position, 2-3 pole switch.

                        Comment


                        • #13
                          Originally posted by David King View Post
                          Lucas,
                          That would be the ideal configuration. Not sure how the switching would go for that but it shouldn't be hard to figure out for a 3 position, 2-3 pole switch.
                          that's what I am thinking.

                          Comment


                          • #14
                            Position one would be P solo with one coil RW.
                            Position two would switch the phase of 1/2 the P and add in the J
                            Position 3 would solo the J.

                            All the P magnets would be S up. All the J magnets would be N up.

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                            • #15
                              Originally posted by Lucas View Post
                              so then a split P is connected differently when in a PJ setup? They are wired in phase with each other and the J bridge pup is wired out of phase. When Split P by itself, each coil is wired out of phase, or CW/CCW direction.
                              No, it's a humbucker. The two coils are either wound in opposite directions, are connected electrically in phase, or wound in the same directions and connected electrically out-of-phase, just as with any humbucker. Then the opposite polarity magnets puts both coils in phase with each other in regards to the strings.

                              So if you add a bridge pickup, the two halves of the P will be in phase.

                              Regarding winding, doing the standard 10,000 turns per coil should never result in a muddy sounding pickup. P basses are much brighter than a lot of people think.
                              It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein


                              http://coneyislandguitars.com
                              www.soundcloud.com/davidravenmoon

                              Comment

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