Thats correct for triphase you connect both "-" with the switch as seen in the schematic.


Thank you. I notice I got the wrong kind of a switch for this (two pins, not three) - I suppose it would also work if the only purpose of the switch is to either bridge the "L&R -" outputs or separate them?

All the rest of the schematic seems clear to me but can somebody clarify how to connect the triphase switch?

Below is an example where I would use the outer connectors. I suppose the correct wiring depends on the switch too? I don't know if this is right, I'm just providing the picture to make it ...

You want an audio line transformer of a reasonable physical size that has the right turns ratios, the one described doesn't sound like it is one. People are able to find the correct ones depending on their location. If you are looking for the right one, knowing your country would help with ...

Hey,

I'm looking to build one of these too. All other parts were easy to source but the transformers seem more tricky.

Model: Compact transformer unencased, vertical model
Primary: 230VAC 47-63Hz
Secondary: 24VAC
Power: 25VA
Dimensions: 52 x 55 x 89 mm

voltage: 2 x 24V
current: 2 x 0.250A ...