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Could somebody please help make this work?

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  • Could somebody please help make this work?

    Hi,
    This is my first post on this forum but like many others i've been reading a lot of great stuff on here for a while and it's been incredibly helpful and inspiring.
    I built a guitar for my little brother at a course run by a local luthier and being curious/stupid i've changed the electronics a number of times. I've come up with one circuit that is interesting in theory (to me at least) but doesnt quite work. I understand that it may not sound very good (or good at all) but i would like to figure out what is wrong with it and why it does not work, get it working (if possible) and then evaluate it.
    I've included some photos of the wiring diagram and the cavity. I can't find any soldering problems with my multimeter, i have continuity everywhere i think that i should (for what that's worth).
    When i plug it in, everything works except the capacitors on the rotary. I can't hear any change in sound when i switch between any of them (even straight from bypass to the largest). One of the DPDTs is for phase and the other is and on/off/on for volume-bypass(max volume)/silence/normal(vol pot effective). they both work fine.

    I don't know why, but i have a feeling that the 510kOhm resistor between the rotary common and ground is the wrong value.

    Any and all help or suggestions would be greatly appreciated c:
    Attached Files

  • #2
    yeah, 510k would be as if you had a more conventional tone control on "10"
    there should be a tiny difference, but not a lot.
    try decreasing it, including zero ohms (short to ground), see what sounds best to you

    what values are the capacitors?

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    • #3
      Originally posted by frus View Post
      yeah, 510k would be as if you had a more conventional tone control on "10"
      there should be a tiny difference, but not a lot.
      try decreasing it, including zero ohms (short to ground), see what sounds best to you

      what values are the capacitors?
      thanks, i'll try that. i put the resistor in to stop pops when switching, if the pops are loud without a resistor i'll try a couple lower value ones.
      there are 11 caps from 150pf to 10nf
      once it works i'll finally know how it sounds xD
      thanks again

      Comment


      • #4
        It appears, that when the mini on, off, on is in the down position?
        That the wiper of the volume pot is switched out of the circuit?
        Is it really wired like the diagram.
        Try plugging a cord in the jack and check continuity, using a DVOM with the volume pot full on.
        From the tip of the plug through different parts of the circuit.
        I have best luck doing that!
        T
        Last edited by big_teee; 06-07-2012, 07:16 PM.
        "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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        • #5
          Originally posted by TRadja View Post
          i put the resistor in to stop pops when switching, if the pops are loud without a resistor i'll try a couple lower value ones.
          To eliminate the pop when switching you need the resistor to drain off any charge the cap may have built up to ground. Connect the wiper directly to ground.

          You need 11 resistors, one for each cap on the switch. Each resistor would be wired from the end of the cap that is soldered to the switch with the other end going to ground. So the switch will actually be shorting out the resistor directly to ground when any cap is selected.

          You can use a much higher value for these resistors. For example Gibson Varitones use a value of 10M.

          Comment


          • #6
            Originally posted by TRadja View Post
            there are 11 caps from 150pf to 10nf
            1 quick comment, 1 question:
            - 150 pf seems kinda low, about the same as 3 ft of old-school coax cable.
            - Why are you using a stereo jack?

            -rb
            DON'T FEED THE TROLLS!

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