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A voltage regulator is an analog circuit that produces a stable output voltage that doesn't vary with input voltage or load changes. Switching regulators are much more efficient than linear ones.

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producing -2.5V from -12V using LM4040

The is a section of power supply schematics. I have a -12V power supply with a parallel LM4040. I know there is a voltage drop over the 1K resistor . What is the trick of the LM4040 diode which allow …