1.2 – 15V/3A adjustable regulated power supply

  • Rajkumar Sharma
  • 32243
  • moderate
  • Tested



This kit provides a variable output power supply ranging from 1.2 to 15 V @ 3 A.  It uses Low Dropout Positive Regulator LM1084 in TO220 package for delivering variable output voltage.

  • Input – 18 VAC/DC
  • Output – variable output from 1.2 ~ 15 V @ 3 A Regulated low ripple DC voltage
  • Heatsink for regulator IC
  • On board bridge rectifier to convert AC to DC
  • LED indication at input of IC
  • Zener trimmed band gap reference, current limiting and thermal shutdown (provided by IC feature)
  • Power Battery Terminal (PBT) for easy input and output connection
  • Onboard PCB mounted Potentiometer (POT) for varying the output voltage
  • Filter capacitors for low ripple DC output
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 46 mm x 58 mm



Parts List


LM1084 Datasheet




  • yuva

    where is the pcb design sir

    3 years ago
    • admin

      I’ve added the Gerbers and PCB in PDF on the downloads above.

      2 years ago
  • B.M.R industries (carewell) sreenivasulu

    Sir which amp transformer uses sir

    2 years ago
  • admin

    You need a transformer that will be able to deliver ~3A

    2 years ago
  • Ej

    Can i use 24v transformer here? or does the regulator cant handle it? If it does do i need to change the resistors/capacitors?

    1 year ago
    • Using a 24Vac transformer will exceed the maximum input voltage of the regulator. This regulator can’t be adapted to accept bigger voltages than 29V at it’s input.

      1 year ago
      • Ej

        Thanks! How about if i use 12Vac transformer? What would be the maximum output voltage of the power supply?

        1 year ago
        • With a 12Vac transformer you will have ~13-14V max output voltage.

          1 year ago
          • Ej

            Is there other voltage regulator i can substitute? LM1084 is not available here

            1 year ago
  • This circuit is designed for LM1084. Check for other power supplies here: https://www.electronics-lab.com/projectcategory/projects/power/

    1 year ago

Leave a Reply



By continuing to use the site, you agree to the use of cookies. more info

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.