1.2V To 32V 5A Adjustable Power Supply Using LM338K


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


5A_Adjustable_Regulated_Power_Supply_SCH-e1457079670341 5A_Adjustable_Regulated_Power_Supply_SILK 5A_Adjustable_Regulated_Power_Supply_PCB_BOTTOM 5A_Adjustable_Regulated_Power_Supply_BOM-e1457079727626

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