1.2V to 37V Regulated Power Supply – 1.2A

  • Rajkumar Sharma
  • 16964
  • easy
  • Tested


This project provides a variable output power supply ranging from 1.2 to 37 V @ 1.5 A.  Uses industry popular LM317 in TO3 package for delivering variable output voltage.


  •  Input 40 VDC or 28V AC 2Amps
  •  Output : 1.2 to 37 V @ 1.5 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
  •  Relimate 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




  • Aakash

    What are the diffrence between LM317K , LM317T etc..

    5 years ago
    • Electronics Lab

      K is for TO-3 package and T is for TO-220

      5 years ago
  • Charles

    is the potentiomiter 5 volt logic? Could this be removed and have the voltage controlled by Arduino PWM?

    4 years ago
    • admin

      Potentiometer adjusts the current that goes to ADJ pin of regulator, so you can’t replace it with a PWM signal. I would propose to use a digital potentiometer instead.

      4 years ago
  • we cant change the Voltage or not like 28-0-28 i change to 25-0-25 he accept that voltage

    4 years ago
  • How about changing the voltage in 25-0-25?

    4 years ago
  • admin

    This power supply provides a single output voltage. If you need symmetrical power check this project: https://www.electronics-lab.com/project/dual-adjustable-regulated-power-supply-1-2v-to-37v-dc/

    4 years ago

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