This is a simple programmable voltage regulator circuit. With this circuit we can generate a voltage according to our wishes. This circuit is based on L200 IC. This is the figure of the circuit;
Potentiometer R2 is used to fix the output voltage Vo. Following equation show value of the output voltage:
Vo=Vref (1+(R2/R1))
We can obtain a wide range of fixed output voltage by substituting the potentiometer with a fixed resistor and choosing suitable values for R2 and R1.
[Circuit source: SGS-Thomson Application Note]
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