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Reply to "Controlling DC accessories with Relays via Isolated track"

Stan: Something I've puzzled over is why a wall-wart is okay to use in this situation as opposed to other methods that convert AC to DC; like the bridge rectifier on the AC/DC buck converters. I understand that the bridge rectifier creates a separate ground that differs from the transformer ground.

But what does a wall-wart do to make their DC ground compatible? I'm guessing that they use a single diode to produce half wave DC as you have pointed out previously. Then they are simply passing the AC ground through which makes it common with the AC ground from the transformer.

And what about DC from an old computer power supply? Is that not compatible? And how is it that you know this stuff?

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