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Permalink Reply by James Pobog on November 9, 2019 at 12:20pm

Tom, is there any chance you have a schematic (not that I can read them) of that box?

I'm thinking of using a pre-wire harness for the pots and switch, then I just have to figure how to wire it so that there is capacitor selection.

And another question... I don't build 3 string stuff, but for simplicity, is a 3 string setup sufficient for determining sound qualities or should I go 6?

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Permalink Reply by Tom T on November 9, 2019 at 12:56pm

Hi James.

I don't have a proper schematic of the test rig, but give me 24 hours and I will post something.

As for the 3-striing/6-string test rig thing, I'm no expert, but if it were me and I built mostly 6-stringers, I would build a six string rig. The difference in tones from a 0.052" string and a 0.009" string is pretty significant. I think you would want to see how your selected setup worked across the range of string diameters.

Building a six string test rig is not a lot more work than a 3 string rig.

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Permalink Reply by Tom T on November 9, 2019 at 1:03pm

Minor correction.

I looked in my Tone Control folder and found this drawing of the test rig wiring.

Obviously one lead of the three caps connect to a a screw that the alligator clips can attach to.

This original drawing doesn't show the 2nd audio jack that is used as an input for an existing guitar. It simply attaches to the positive and negative tabs of the first audio jack.

I'll try to get something a little cleaner for you tomorrow.

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Permalink Reply by James Pobog on November 10, 2019 at 6:10pm

Pretty cool....but why two 47 caps?

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Permalink Reply by Tom T on November 11, 2019 at 12:50am

I put two 0.047 uF caps so I can chain a 0.047 and a 0.022 together for a 0.069 uF cap or the two 0.047 uF caps for a 0.094 uF cap.

I figured that since I was "testing" why not give some options beyond the two basic values. Remember that caps wired in parallel add together in value.

Beyond the option to try different things, the 2nd cap is not needed.

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Permalink Reply by James Pobog on November 11, 2019 at 3:32pm

What does a 94 sound like?

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Permalink Reply by Tom T on November 12, 2019 at 12:53am

It is different. I call it "muddy", but you should just give it a try so you get a feel for it.

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Permalink Reply by Paul Craig on November 12, 2019 at 7:51am

That would work, but I would use the clip with vinyl covers so as not to short out on whatever they happen to touch.

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