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Old CryBaby wah pedal nnot "wah-ing"

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  • #61
    This type of inductor is clipped together and can be separated to get to the bobbin. If it does appear to be beyond repair then it can be rewound - I've done a few of this type, though by way of experiment rather than repair. I'm in agreement that the most likely break (if any) would be where the external leads/pins connect and careful observation under magnification may show up where the break is. Inductors though are a pretty reliable component so make sure that it really does read open.

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    • #62
      This "Halo" inductor is a P18/11 type pot core without airgap.
      Similar types I built from kits required between 500 and 700 turns. These are just ballpark numbers depending on actual ferrite type.

      If rewinding is required, it is essential to count the original turns. Without knowing the exact turns number you will need an L(CR) meter to determine the AL- value of the core. AL- value is inductance per number of turns squared.

      Inductance of my original '68 halo measures 630mH. Variance between originals can be assumed to be at least 20%.

      When (re)assembling the core make sure that the faces between the core halves are perfectly clean. Even a tiny dust particle will cause an unwanted airgap and drop inductance significantly.

      If the wire broke at one of the pins a repair without rewinding should be possible.
      Last edited by Helmholtz; 10-14-2020, 04:04 PM.
      - Own Opinions Only -

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      • #63
        I get a continuity reading between the pins of the coil, I'm assuming this means the coil is good? But if there were an internal short inside the coil, I'd get continuity also, correct?

        I'm not going to rewind the coil, I'll just put in a new one if need be.

        On closer examination last night (desoldering both joints to the board) I found a completely broken section of the trace, I'll repair this with a flying lead

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        • #64
          Originally posted by Fred G. View Post
          I get a continuity reading between the pins of the coil, I'm assuming this means the coil is good? But if there were an internal short inside the coil, I'd get continuity also, correct?

          I'm not going to rewind the coil, I'll just put in a new one if need be.
          What resistance do measure between coil pins with coil out of circuit?

          AFAIK there is no direct replacement coil regarding appearance and pin spacing. While a generic 500mH inductor will work, a replacement coil would considerably lower the value of the pedal and might change the sound.

          Rewinding is easy and invisible and won't change the sound if well done..

          I'm sure a rewound or open original '68 halo inductor has some collectors' value (though I would not spend more than 50€ if I needed one ).
          Last edited by Helmholtz; 10-14-2020, 07:16 PM.
          - Own Opinions Only -

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          • #65
            FIXED!!! I wired a flying lead from the terminal of the inductor where the board trace had lifted and broken. Voila, wah wah!

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            • #66
              Congratulations.
              Persistence is always rewarded in the end.
              Who does not know and knows that he does not know - teach him Confucius)
              Who knows and does not know that he knows - wake him Confucius)

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              • #67
                Well, it's good to know I can come here with questions and get a great supportive response! Thanks everyone, I appreciate your help!

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                • #68
                  Originally posted by Fred G. View Post
                  I get a continuity reading between the pins of the coil, I'm assuming this means the coil is good? But if there were an internal short inside the coil, I'd get continuity also, correct?
                  Glad to hear you got it fixed. If your meter does have a continuity setting, then yes, a shorted coil and a good coil would both give a 'go' reading for continuity.

                  But to clarify what I said earlier about 'continuity', it doesn't really mean a lot unless we say exactly what we mean by it.
                  Some meters have a continuity beeper. It may beep at anything less than 200 ohms. Other meters will only give the continuity beep if the reading is less than 40 ohms. I would argue that a 100K resistor that measures near 100K has 'continuity'. So it really is kind of nebulous and it is much preferred to stick with 'resistance' and actual ohms readings.
                  Continuity is something I think is probably intended for wiring, like automotive or household electrical. You either have a continuous wire (some low ohms) or open connection..



                  "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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                  • #69
                    I totally see your point. I was thinking about this last night, I mean, logically, if there's a connection, there should be "continuity", but I can see that it can be a very arbitrary consideration. You should, logically, see "continuity" across both sides of a given resistor, but as you said...at any rate, thank you for the discussion, and for your help!

                    Fred G.

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                    • #70
                      Originally posted by g1 View Post
                      Continuity is something I think is probably intended for wiring, like automotive or household electrical. You either have a continuous wire (some low ohms) or open connection..
                      Checking continuity is useful when you expect a low resistance but don't need to know the exact value. E.g.: Tube heaters, low voltage bulbs, shorts and opens, switches, intermittent contacts/shorts etc.
                      It is especially useful for tracing circuits (finding connected components/circuit points).

                      To avoid misinterpretation the meter's resistance limit for "continuity" should be known.
                      Last edited by Helmholtz; 10-15-2020, 07:18 PM.
                      - Own Opinions Only -

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                      • #71
                        When checking multiple wiring connections it may be useful to hear the continuity 'beep'.
                        Personally, I want to know what the resistance reading is.
                        A case in point. A few ohms high on a multiple switch series circuit can be all that it takes to bring the sense circuit to a halt.

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                        • #72
                          A few ohms high on a multiple switch series circuit can be all that it takes to bring the sense circuit to a halt.
                          Right, but I didn't mean checking contact quality but identifying switched contact pairs of an unknown switch or relais.

                          BTW, my DMMs beep and read resistance at same time and my old analog meter changes sound when it doesn't see a perfect short and doesn't beep above 10R.

                          As always: Know your meter(s).
                          Last edited by Helmholtz; 10-15-2020, 09:16 PM.
                          - Own Opinions Only -

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