5A Adjustable Regulated Power Supply

  • Rajkumar Sharma
  • 18061
  • moderate
  • Tested


This project provides a variable output voltage ranging from 1.2 to 32 V @ 5 A. Project based on LM338K IC, LM338K is adjustable 3 terminal positive voltage regulator capable of supply in excess of 5A over a 1.2V to 32V output range, simple circuit consist few components.


  • Input Supply : 24 VAC or 30 VDC, 5 Amp
  • Output : variable output from 1.2 to 32 V @ 5 A regulated low ripple DC voltage
  • Heatsink for regulator IC
  • Onboard bridge rectifier to convert AC to DC
  • LED indication at input of IC
  • Thermal overload/short circuit protection (provided by IC feature)
  • Screw terminal connector for easy input and output connection
  • Berg connector for connecting potentiometer (POT) to the PCB
  • Filter capacitors for low ripple DC output
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 91 mm x 66 mm



Parts List




  • How about changing the Current like 2 Amp

    2 years ago
    • admin

      You may use a smaller transformer of 2A and have that output as maximum.

      2 years ago
  • JC Droog

    how about current control

    2 years ago
    • admin

      This power supply doesn’t support current control. We are sorry.

      2 years ago
  • mohamed

    in this circiut it needs feedback to make the voltage constant and doesent decrease when adding load at the output how to make this circiut regulated ?????

    11 months ago
    • admin

      Feedback is implemented with R1 and R2, so this is a regulated power supply.

      11 months ago

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