This is a circuit a programmable voltage regulator circuit. With this circuit we can generate a voltage according to our wishes. This circuit uses 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. [Source: SGS-Thomson Application Note].
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. [Source: SGS-Thomson Application Note].
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