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I would use 0.1µ at least on input 2. Voltage rating can be low.
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I was having trouble figuring out a way to solve this without having to tell the owner to use input 2 to avoid the scratchy sound when manipulating guitar volume control and have to accept that the volume is lower due to the 68K/68K voltage divider. In case anyone is curious, the solution I came up with is put the 0.1uF cap between R1 and R2/R41 (as discussed above) and change R1 to 10K and R2 to 120K. This way the owner can use input 2 to avoid the scratchy sound and there is only a slight difference in volume compared to input 1. The input impedances for the 2 inputs remain pretty much the same.Comment
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As mentioned earlier, the best solution would be using a coupling cap directly on each input jack, i.e. before any resistors. Means 2 caps.- Own Opinions Only -Comment
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Well this is weird. So I went and wired it up as I described. I used a bit of heat shrink and when I went to shrink it of course that area got heated up somewhat. There was some smoke which I assumed was just residue from the flux I had used. But now the DC on the grid is completely gone! No more scratchy sound, even on input 1! Maybe I should have followed up with xtians suggestion before going the route I did. Anyway, it was a learning opportunity either way.Comment
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I did ask for clarification, post #38.Originally posted by Helmholtz View Post
In any case, I mean it wasn't clear to me that you meant to say I should connect caps directly to the tips as opposed to input 1 and 2 in general as per the usage in other posts in the same discussion.
Misunderstandings happen. At the end of the day it was a good theory exercise for me. As always, I appreciate the help!Comment
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