+/-12V Dual Power Supply

  • Rajkumar Sharma
  • 83822
  • moderate
  • Tested


This project is a solution to power up most of devices or projects requiring dual (+/-12V) power supply.


Symmetric +/-12 VDC power supply has been designed for audio applications, can power up microphone pre-amplifier, audio buffers, audio mixer, distributions amplifier, headphone amplifier, VU meter and few o other equipment or projects required dual supply.


  • Mains supply input 240 VAC
  • Step Down Transformer 15-0-15V AC @ 350mA.
  • Output +/- 12 VDC Dual, 350 mA
  • Regulated Low ripple DC output
  • Earth connection for chassis ground
  • Onboard regulator for stable supply
  • Dual output LED indication
  • Supply input & output via screw terminal connector
  • Dual unregulated output +/- 22 VDC via berg connector








  • Neliswani

    Would you please send me the PCB layout files, i need to make this dual power supply for a project at work.

    5 years ago
    • Electronics Lab

      We are sorry, only the image files of PCBs are available.

      5 years ago
      • lovely

        please send me the PCB layout files, i need to make 12volt dc power change in 12-0-12 power supply for a project

        4 years ago
    • Farhan Shams

      may i send u

      5 years ago
    • admin

      We uploaded above a PDF file that includes the PCB design so you can print and build for your self.

      4 years ago
  • Brajesh Rajawat

    I want ac power supply 0 to 12 volt for my project was it is help ful

    5 years ago
  • Rishabh Upadhyay

    I want to buy a +- 15 volt dual power supply or +-20 volt dual power supply, for project work.
    can you help please?

    5 years ago
    • Electronics Lab

      We are sorry, we don’t sell kits of our projects.

      5 years ago
    • vinay Vishwakarma

      just change the voltage regulator in circuit with 78xx & 79xx where xx ins required voltage

      5 years ago
  • Muzzamil

    Kindly send me layout file of dual power supply 12v dc

    5 years ago
    • Electronics Lab

      The files available are on PCB section above.

      5 years ago
  • hello, can i do this project but with a transformer 120-24 V? I cant find one that is 120-30 V.

    5 years ago
    • approximately how much is that ouput voltaje? i think that it will give me like 10V

      5 years ago
    • Thank you all for the time that it took to answer my questions, i really aprecciate it.

      5 years ago
  • Raj

    HI, adrianhuidobro

    This power supply will work perfectly with 24V (12-0-12) Transformer, and it will provide +/-12V DC.

    This project has bridge rectifier and usually during each half cycle the current flows through two diodes instead of just one so the amplitude of the output voltage is two voltage drops ( 2 x 0.7 = 1.4V ) less than the input VMAX amplitude. The ripple frequency is now twice the supply frequency (e.g. 100Hz for a 50Hz supply. Peak V is theoretically ~1.414 times the RMS voltage. So if you use 12-012 Transformer output would be 12X1.4= +/-16.8V DC Approx. 7812 and 7912 regulate the voltage and provides +/-12V DC.

    5 years ago
  • Raj

    Rishabh Upadhyay,

    If you wish to use this power supply for different voltages,
    You will have to change the regulator Part no & Transformer voltages as per bellow details
    For +/-5V DC Output
    Regulator LM7805 & LM7905 and AC transformer 5-0-5 V AC to 12-012 VAC

    For +/-15V DC Output
    Regulator LM7815 & LM7915 and AC transformer 18-0-18 VAC

    For +/-18V DC Output
    Regulator LM7818 & LM7918 and AC transformer 24-0-24 VAC

    5 years ago
  • Jacob Newman

    is it possible for this power supply to have 2 outputs i.e. able to have 2 wires leaving it which both supply a voltage?

    4 years ago
    • Electronics Lab

      This power supply has two outputs, one is +12V and the other is -12V and both outputs have same ground reference.

      4 years ago
      • Dineh

        can i use 12 0 12 @1amp transformer

        4 years ago
        • admin

          Sure, it will work but you will have lower output voltage. Also you should use heat-sinks on the ICs.

          4 years ago
  • Arnav Jain

    How can i get 4 amperes with this power supply, as the ics are rated at 1amp Max i cant get a transformer which is more than that, so i need more amperes

    4 years ago
  • sourabh Khanke

    I want to order the circuit in 20 quantity urgently
    8623050207 call me or WhatsApp me

    2 years ago

Leave a Reply


PS5 & XBOX Series X Giveaway

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.