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f-alpha.net » Electronics » Integrated Circuits » Voltage Regulator » Let's go... » Experiment 13 - Adjustable VR II

Experiment 13 - The Adjustable Voltage Regulator LM317 II

Hence replace the resistor R2 by the potentiometer P1.

Circuit diagram free adjustable voltage regulator LM317.

Freely adjustable voltage regulator circuit LM317. (Enlarge)

Now you can freely adjust the output voltage between...

  • By turning the potentiometer to one side, P1 = 0 Ω...

Vout = 1.25 × (1 + 0/1000) + (0.00005 × 0)

        = 1.25 Volt

  • By turning the potentiometer to the other side P1 = 5 kΩ...

Vout = 1.25 × (1 + 5000/1000) + (0.00005 × 5000)

        = 7.75 Volt

However, the LM317 has a drop-out voltage VDO = 2 Volt. With an input voltage Vin = 9 V, as in this circuit, the output voltage can be adjusted between a minimum of 1.25 V and a maximum 7.0 V.

But what about the heat generation of the adjustable voltage regulator...?

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