bobschwenkler
Well-known member
Who else has built this circuit with the DI? I made an 8 channel unit years ago and never got around to really figuring out why the DI is as noisy as it is. The noise floor is not overpowering or anything, but it's clearly audible, perhaps 30-40dB down with an old Epiphone guitar plugged in. Other sources give similar results.
I've tried a little bit of experimentation with no improvement. I dropped the 2.2M input R to ~.5M, my input signal goes up accordingly (it forms a volts divider with the 1M to ground at the amp input) but the noise floor seems the same.
I thought perhaps it has to do with poor matching of OSI for the op amp but noise remains the same with signal generator plugged in.
Any thoughts?
I've tried a little bit of experimentation with no improvement. I dropped the 2.2M input R to ~.5M, my input signal goes up accordingly (it forms a volts divider with the 1M to ground at the amp input) but the noise floor seems the same.
I thought perhaps it has to do with poor matching of OSI for the op amp but noise remains the same with signal generator plugged in.
Any thoughts?