Switch Mode Power Supply 115VAC-5VDC

Discussion in 'The Projects Forum' started by boingaon, Dec 27, 2014.

  1. boingaon

    Thread Starter Member

    May 15, 2012

    I'm designing a power supply for a desktop aquaponic gardening system. I need to provide 5VDC to my microcontroller, pump and other components.

    I've researched how to rectify and smooth a 115VAC line using a transformer but the transformers that I am finding are quite a bit larger than some of the 5VDC power supplies I've found (like Apple iPhone charger).

    After researching some tear-downs of the Apple iPhone charger, I discovered that the transformer being used is a "flyback transformer". These transformers can create high voltages on their secondary side with minimal turns.

    What is the best way to learn how to create a power supply like this? I'm needing to convert 115VAC to 5VDC with a current capacity of about 1A.

    Thank you
  2. #12


    Nov 30, 2010
    Do you need a power supply or do you want to learn how to design switch mode power supplies? I would suggest your plants will die before you can learn the whole process from scratch. Therefore, I say common and cheap power supplies are available to fit your purposes.
  3. MaxHeadRoom


    Jul 18, 2013
    Ebay 301439448983 2amps $3.00
    #12 likes this.