TH Custom - Balanced Line Driver

[Neil mcNasty]

Here is TH Custom's "Balanced Line Driver", that can be added to any pedal in order to get a balanced line output via XLR.
Or it can be built as a standalone unit, like I intend to do...
It is not a full D.I.Box design, but something close, intended for guitar/bass signals.
Cool thing is that it runs of a standard +9v supply instead of 48v phantom power.
It also has protection from 48v phantom power at the XLR end, so that a 48v feed from a mixer does not fry it.

I've looked over it a couple of times, and it seems ok, but it is not built and verified yet.

[Muadzin]

I have built several of these and they're great.

[Neil mcNasty]

Did you use this layout or the TH Custom boards?

[Muadzin]

All TH Custom boards, there was no vero layout at the time. If there was I would have given it a try.

I mostly use these together with a buffered splitter and a cab sim board. The idea was to split the signal, one going to a guitar amp, the other through the cab sim board into the balanced driver and then into a mixing desk. Kinda like a Red Box.

[doxasound]

Can anyone confirm this is verified/works?

[doxasound]

Built two of these, but haven't tested them yet. So far, the 100uf filter cap is backwards.

[Neil mcNasty]

Layout has been updated with correct filter cap orientation...

[doxasound]

Thanks, Neil!

I'm waiting on a few parts to finish this.

I'm actually using this for a RE-AMP build I'm working on.

Never tried it, but hoping it works well!

Definitely will verify if it does/doesn't!

[doxasound]

Just tested both of my Line Drivers and I'm getting guitar, but a lot of white noise.

I saw the THCustom's build doc and followed what it said about C4, C5 being bipolar 10uf caps.

I also made sure the circuit was enclosed to rule out any RF, etc.

I think I used a 1044S.

Anything else I could try? Anyone?

[doxasound]

I used ICL7660S, actually.

[nobodd]

this can be marked as verified. built one to spec and it fired up with no issues. one suggestion would be to label the function of the trimmer. great work and thank you!

someone mentioned that they were getting white noise or hiss. i suspect they may not be using the correct output cable or possibly are trying to use an adapter to hook it up to an amp via 1/4 without wiring it properly. that is the noise you will get when whatever you are hooking this up to is not receiving the full balanced signal.