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  • Here are 4 simple 12V power supply circuits with output voltages around 12V. First power supply circuit is built with BD139, one zener diode and a few passive components. Each of the schematic is very simple to construct and will function without problems if you respect the maximum power supply ratings.

    12V dc power supply schematics

    12V BD139 power supply circuit

    bd139 12v dc power supply

    LM7812 power supply schematic

    A very simple PS circuit with the basic 3 Amper version of LM7812 IC.

    7812 12v power supply

    LM317 variable power supply circuit

    lm317 12v dc power supply

    2N3055 adjustable power supply schematic

    This power supply circuit has a over-current protection and a good stabilized voltage. It can deliver up to 1.6 A.

    2n3055 12v dc power supply

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    4 Responses to "Simple 12V DC Power Supply Circuits"

    1. Sir. geepas fan curcit gr9418repayr

    2. Have a bad resistor in the attached picture. R4 is circled and need to know what the ohm value is if anyone can help?

    3. ColdMan SE says: on March 3, 2015 at 4:28 am

      Dear, Mike J
      R1,R2,R3 and R4 Seems to Be Same.

    4. Did you look at the picture? They all have different color codes.

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