Variable DC Power Supply using LM317

Below is the circuit for variable dc power supply


R1- 240 Ω

R2- 5K VR

R2 can be replaced by fixed value resistor for fixed power supply. Following formula can be used to calculate output voltage.


Output voltage should be2 voltage greater than input.

Parts for current setup

  •  D1, D2 – 1N4001
  • C1-0.1 μ
  • C2 – 10 μ 50v
  • voltage regulator – LM317


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