In a 3-terminal power supply like this, are there individual regulators behind the positive and negative terminals? For example a LM317 on the positive and a LM337 on the negative?
If not, what kind of circuitry drives a floating output like this, in general?
Side question, probably related: If you can connect either terminal to ground, why doesn't the connected terminal dump current into ground?
I want to build or buy a bench power supply, and I'm having trouble understanding how one control set can drive positive or negative voltage.