Ad Widget

Collapse

Announcement

Collapse
No announcement yet.

The reference thread for newbies!

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #46
    Originally posted by Biarnel View Post
    This is one of the most confusing thread of my forum reader career


    As I wrote somewhere in this thread, my counter has no battery.
    It's a mechanical stroke counter.
    I think that DrStrangelove is talking about your ohmeter battery.
    On the photo you joined it doesn't look like you have 7500 turns on a 9mm (0.354") tall bobbin.

    Comment


    • #47
      It really does sound like you got the wrong gauge of wire. Maybe it's 42SWG, which works out around 38AWG.
      "Enzo, I see that you replied parasitic oscillations. Is that a hypothesis? Or is that your amazing metal band I should check out?"

      Comment


      • #48
        It's not easy to know it for certain, anyway.
        Is there a way to have certain proof of the wire gauge? A caliper it's not accurate enough..
        Biarnel Liuteria
        Italian handmade guitars and basses
        http://www.biarnel.com/liuteria/
        http://www.myspace.com/biarnel

        Comment


        • #49
          hmmm 7500 turns with 38AWG magnet wire would end up with a huge coil. Are you shure that your counter at hight speed doesn't count twice one turn?

          Comment


          • #50
            Give that man a drink!

            Originally posted by Steve Conner View Post
            It really does sound like you got the wrong gauge of wire. Maybe it's 42SWG, which works out around 38AWG.
            Outstanding insight, Mr. Conner.

            42SWG ~ 38AWG. When I run the simulation with 38AWG,
            7500 winds at 62% fill factor (scatterwind) is 1800 ohms,
            much as Biarnel initially reported.

            -drh
            He who moderates least moderates best.

            Comment


            • #51
              What's that simulation software?
              Where may I find it?
              Biarnel Liuteria
              Italian handmade guitars and basses
              http://www.biarnel.com/liuteria/
              http://www.myspace.com/biarnel

              Comment


              • #52
                here
                Originally posted by EtLa View Post
                With Zielgler Pick-up calculator http://pickups.myonlinesite.com/programs.php I get 3642 ohms for 7500 turns

                Comment


                • #53
                  Well, if Steve gets a free drink, I'm a bit thirsty myself

                  Comment


                  • #54
                    7500 winds on that coil
                    Last edited by EtLa; 07-26-2007, 04:18 PM.

                    Comment


                    • #55
                      Dimensions dementia

                      First off, Dave Kerr gets kudos and a glass of his favorite beverage
                      for suggesting that the wire might NOT be #42 AWG.


                      There was some confusion about the bobbin core size initially, too.

                      Using Adam Zeigler's pickup winding calculator at
                      http://pickups.myonlinesite.com/pickup.php
                      select millimeter, and plug in these values:

                      Core Length: 28
                      Core Width: 10
                      Core Height: 9
                      Bobin Width: 40
                      Bobin Thickness: 3

                      Wire Diam: .1016
                      Insulation Diam: .1143

                      ...then recalculate for 7500 winds, get 1590 ohms, about 10% low.
                      This value corresponds to an ~88% fill factor which derives from an
                      assumption of hexagonal lattice packing.

                      I get ~1800 ohms at 78% fill factor, so I'm guessing Biarnel tends to
                      wind more tightly with #38 (.1016mm) than when using #42 AWG (.07mm).

                      Empirically, scatterwinds average about 62% fill factor.

                      My winding estimater program is still a prototype in C that will probably
                      get translated into JavaScript too late to be of any use.

                      -drh
                      He who moderates least moderates best.

                      Comment


                      • #56
                        Originally posted by DrStrangelove View Post
                        First off, Dave Kerr gets kudos and a glass of his favorite beverage
                        for suggesting that the wire might NOT be #42 AWG.
                        Ok, I have a micrometer now.

                        I'm reading in INCHES and WITH the insulation.
                        Please tell me if I should burn off insulation before taking any measurement.

                        The wire I used reads 0.0028" WITH INSULATION.
                        The guy who sold it keeps on saying that it's an AWG42 and that I'm not tensioning it enough.

                        UPDATE!
                        Burning away insulation, I read 0.0022", wich is AWG42 accordingly to various tables.
                        Biarnel Liuteria
                        Italian handmade guitars and basses
                        http://www.biarnel.com/liuteria/
                        http://www.myspace.com/biarnel

                        Comment


                        • #57
                          Originally posted by Biarnel View Post
                          Ok, I have a micrometer now.

                          I'm reading in INCHES and WITH the insulation.
                          Please tell me if I should burn off insulation before taking any measurement.

                          The wire I used reads 0.0028" WITH INSULATION.
                          The guy who sold it keeps on saying that it's an AWG42 and that I'm not tensioning it enough.

                          by looking at the coil I estimate around ~3800 turns with 42 AWG
                          Core Length: 28
                          Core Width: 10
                          Core Height: 9
                          Attached Files

                          Comment


                          • #58
                            Originally posted by EtLa View Post
                            by looking at the coil I estimate around ~3800 turns with 42 AWG
                            PLease believe me: it's 7500 turns.
                            Coil size tends to alter perception, but it's quite a fat and bulky winding.
                            keep in mind that mags are 10mm dia.

                            Could the tensioning be the key?
                            Biarnel Liuteria
                            Italian handmade guitars and basses
                            http://www.biarnel.com/liuteria/
                            http://www.myspace.com/biarnel

                            Comment


                            • #59


                              with 7500 tuns I estimate at least ~4mm of winds.

                              Comment


                              • #60
                                Originally posted by DrStrangelove View Post
                                I get ~1800 ohms at 78% fill factor, so I'm guessing Biarnel tends to
                                wind more tightly with #38 (.1016mm) than when using #42 AWG (.07mm).
                                Sorry, but maybe my knowledge of english language is betraying me.

                                What do you mean with that?
                                I did not use #38, that was a #42, I just checked with a micrometer (0.0025" without insulation).
                                Are you trying to tell me that my tensioning is poor? I just make the wire slide thru my index and thumb...
                                Biarnel Liuteria
                                Italian handmade guitars and basses
                                http://www.biarnel.com/liuteria/
                                http://www.myspace.com/biarnel

                                Comment

                                Working...
                                X