Online questions about power supplies

Hello,
what can make a switched-mode power supply not to supply expected voltages according to design?
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More about online questions power supplies
  1. bad design
  2. Sounds like a homework question to me.
    Bad design, poor quality materials and workmanship, it being strained too far or not strained enough and possible dirty power it receives from the wall.
    If you want a practical example of this, go to your local computer market and buy the cheapest beige PSU of the highest wattage you can find. Bust that open, you will see what makes a bad PSU tick.
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