1.2 – 15V/3A adjustable regulated power supply

  • Rajkumar Sharma
  • 32243
    Views
  • moderate
  • Tested

photo

Specifications

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

Schematic

schematic

Parts List

parts

LM1084 Datasheet

lm1084

PCB

Comments

  • 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

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