Series voltage regulator circuit diagram with adjustable output voltage

The circuit output voltage can be continuously adjusted from zero to maximum. The reference quantity is a constant current circuit powered by an auxiliary power supply. The reference current can be adjusted by a 500 ohm trimmer resistor, and its value should be about 7mA. This current flows through the 2.5k ohm potentiometer and forms a voltage drop from zero to the maximum value of the output voltage, thereby making the output voltage Ua continuously adjustable from zero to the maximum value.

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