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Have you ever needed a 12 volt power supply that can supply maximum 1 amp? But trying to buy one from the store is a little too expensive?

Well, you can make a 12 volt power supply very cheaply and easily!

Step 1: Things that you will need…

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Things that you will need to make this power supply is…

  • Piece of protoboard
  • Four 1N4001 diodes
  • LM7812 regulator
  • Transformer that has an output of 14v – 35v AC with an output current between 100mA to 1A, depending how much power you will need.
  • 1000uF – 4700uF capacitor
  • 1uF capacitor
  • Two 100nF capacitors
  • Jumper wires (I used some plain wire as jumper wires)
  • Heatsink (optional)

Step 2: And the tools…

Also you will need the tools to make this power supply…

    • Soldering iron
    • Wire cutters
    • Wire strippers
    • A thing you can cut protoboard tracks.
    • Hot glue (To hold components down and make the power supply physically strong and sturdy.)
    • And some other tools that you might find helpful.

Okay, I think that is about it, lets get to work!

Step 3: Schematic and others…

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Picture of Schematic and others...
If you want a 5 volt power supply, just simply replace the LM7812 to a LM7805 regulator.
Datasheet for LM78XX

If you are going to pull out about 1 amp from this power supply, you will need a heatsink for the regulator, otherwise it will generate very high temperatures and possibly burn out…
However, if you are just going to pull out a few hundred milliamps (lower than 500mA) from it, you won’t need a heatsink for the regulator, but it may get a little bit warm.

Also, here’s the schematic…
I also add in an LED to make sure the power supply is working. You can add in an LED if you want.

Step 4: Make it!

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Make sure you get good solder joints and no solder bridges, otherwise your power supply won’t work!

Step 5: Test it!

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After you had built your power supply, test it with your multimeter to make sure they are no solder bridges.

After you tested it, put it in a plastic box or something to protect you from shocks.
But do not operate the power supply like I did, it is very dangerous because of the mains voltage on the transformer, you or somebody will get badly shocked!

My power supply has 11.73v output, not too bad, I don’t need it to be exactly 12v…

Step 6: Done…

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Source : Instructables