If I were to want to put a balanced out on a build in addition to the regular output (thinking I could utilize that straight into my audio interface) how hard would that be to add into a circuit? could it just be something added between the output of the board and the output jack? I saw a post from Wilkie1 that mentioned it in reference to the Paramix, but I don’t know if the same would apply here as I’m not using the Paramix in this case. would anyone happen to have a schematic of how to do this?
I sent Barry a prototype DI box with extra features including balanced XLR a couple of years ago. He did not have many folks interested in it at that time. I will be happy to help if anyone is interested. Here is a photo of the one I made for Barry.
I’m interested in this also and have collected a DI pcb and XLR jack and a dual buffer from another store. Occasionally I plug into a friends PA just for home / acoustic fun. parts are stacking up, better get to building.
Here is some more info. The basic DI circuit is nothing more than a buffer and a final gain stage that has an extra opamp that takes the output and inverts it to provide the extra output needed for the balanced XLR jack. I used the basic circuit that Jack Orman published.
Then I added these features as options: Switch for -15dB input pad, High cut filter, input attenuator pot, -15dB output pad switch, phase invert switch, output level pot, ground lift switch, Marshall 4X12 cab sim switch, bypass 1/4″ jack, Inverted out unbalanced 1/4″ jack, normal out unbalanced 1/4″ jack, balanced out TRS 1/4″ jack, balanced out XLR jack.
I did not add a phantom power switch but that is possible. I used a smaller vero for the cab sim circuit and a larger one for the rest of the design.
I made one of these for a local club sound man. I hope this helps inspire builders!
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