Wet / Dry boxing using 2x Signal Buffer / Inverter PCBs

[Ctrl4Smilerz]

Hi all,

I would like to dip my toes in the Wet/Dry amp world. I was thinking of using 2x Signal Buffer / Inverter PCB's but have a few questions:

1) Do I simply wire both boards to the the tip of the input or is there a better way to do it?
2) Is there an easy way to add a ground lift to one of the outputs?
3) Is a SPDT (On/On) the best choice to control the phase?
4) Is there anything else that would improve this project?

 

[giovanni]

1) I think that should work, assuming the buffer has a capacitor in the input stage. I would experiment and see. If that does not work, you can put a buffer before the two buffers. That would solve any loading issues but there should be none because those buffers should have a very high input impedance.
2) I’m not an expert here. I heard that it’s doable but I would just add a transformer after the buffer to be safe.
3) I think that should be fine since the circuit has both in and out of phase signal. You need that only for one of the outputs.
4) besides the transformer, you may want to consider making one of the output foot switchable. I think that may come in handy.

Let me know how that is, I have been wanting to try dual mono forever. I am a fan of TPS and really like their dual mono setup. Btw @JamieJ sent me a board that does exactly what you’re trying to do. I never built it because I’m the worst