I've been trying to shield my Flying-V using copper foil in the cavity and 'star-grounding' but I must have a ground loop or something somewhere as my guitar buzzes loudly when the volume control is turned down -- until I touch the strings or metal parts. (The buzz gets louder if I touch the body of the guitar but not the metal.) The wiring includes a bridge ground wire. This and all the pickup grounds and shields go to a screw driven into the shielded cavity. The ground lugs on the pots have been disconnected from the circuit.
I've been playing around for hours with a multimeter and a pair of crocodile clip connectors but I'm still left scratching my head. Can anyone help?
Last Edit: Feb 12, 2007 15:14:08 GMT -5 by wickerman
Something else I should mention... Both pots are wired as volume controls for the pickups. The circuit works fine but for the noise.
I've been re-reading the Strat shielding instructions and it says the "star" ground should be insulated from the copper shield. So I tried removing the screw and attached all the ground wires to a washer which did not touch any other part of the circuit. No change.
I've gone about as far as I can with this problem now and I'm just about ready to take it to a professional to get it sorted. Can anyone save me a few bucks by helping me out?
Last Edit: Feb 13, 2007 10:37:55 GMT -5 by wickerman
I think the original Quieting the Beast mod has all the grounds going to the back of a pot. So, I guess that would put them in contact with the copper shielding before it goes to the actual ground wire connected to the bridge & strings. I don't think that makes a difference though.
The first time I did the QTB mod, that's how I had it, (all the grounds to the back of a pot) and it worked fine, but that was just stock Stratocaster wiring; I've never tried to wire up a guitar similar to how your Flying-V is
Here's a good article, it helped clear some things up for me:
The QTB instructions say to disconnect the ground tab on each pot from the pot casing (where it normally gets bent back and soldered) and instead wire the output jack ground directly to this; then to wire this point to the star terminal. I tried this but it didn't fix the noise when the volume pot was turned down.
Last Edit: Feb 13, 2007 14:45:12 GMT -5 by wickerman
I can't do this and fully shield it? What's the alternative -- wire the second pot as a tone control? What would happen if I just wired the grounds to the back of the pots as normal? I guess keeping it quiet is what I want most.
So should the star ground point be isolated from the shield or connected to it? I still don't get this part.
BTW, I just tried connecting it back up using crocodile clip cables (second pot as tone control with ground tab going to the star ground) and it was still noisy with the pots rolled down.
Last Edit: Feb 13, 2007 17:37:54 GMT -5 by wickerman
I've done it! Or at least I've got it functioning how I wanted with the minimum amount of noise. Both controls wired as volume, but I reversed the input and output wires on each pot. The rest is wired as instructed in QTB. There's a very small amount of buzz when I take my hands off the strings but I can live with it.
Last Edit: Feb 14, 2007 2:39:45 GMT -5 by wickerman