15V 1A Regulated Symmetrical Power Supply

15V 1A Symmetrical Power Supply Circuit Schematic

This is the easy built 15V 1A regulated symmetrical power supply capable to deliver stabilized voltage of +15V DC and -15VDC. The maximum current output is about 1 ampere up to 1.5 ampere refer to the datasheet. The circuit uses IC regulator LM7815 for positive voltage and LM7915 for negative voltage. To obtain different voltage output, just replace the IC regulator LM78xx and LM79xx, the xx code is the output DC voltage value.

Component List

  • Transformer: 1A center tap transformer with output 15 0 15 : 1
  • Diode 1A (1N4006 or 1N4007): 4
  • Electrolytic capacitor 4700uf/25V: 2
  • Nonpolar capacitor 1uF (100nF): 2
  • IC Regulator LM7815: 1
  • IC Regulator LM7915: 1


  • You may add a fuse between mains to the transformer
  • You may add a LED indicator on the positive output and ground (series joint with resistor 470 ohm)

15V 1A Regulated Symmetrical Power Supply PCB Layout Design

15V 1A Symmetrical Power Supply PCB Layout Design

15V 1A Symmetrical Power Supply Component Layout

That’s all, goodluck

Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Tags: 15v power supply Dual polarity power supply stabilized power supply symmetrical power supply

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