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Dual Regulated Supply from Single Voltage - Dual +/- Regulated Supply from Single Floating Voltage source without a Virtual Ground Circuit
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Dual Regulated Supply from Single Voltage - Dual +/- Regulated Supply from Single Floating Voltage source without a Virtual Ground Circuit
Here is a circuit that can generate dual plus/minus regulated voltages from a single unregulated floating supply, such as from a wall-wort or a single-winding transformer supply with no center-tap. The trick is that the low drop-out regulators used can either sink or source current. Thus, for example, if the positive current drawn is more than the negative current, the bottom (negative) supply can sink the current difference to maintain regulation. A typical regulator can only...
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