24V AC to DC Rectification / Converter

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    Need to power a Raspberry Pi, Arduino, or other device from a 24V AC source? These 24V AC sources are common for sprinkler controllers, doorbells, and thermostats. This is a quick guide to how I am doing it to power my Raspberry Pi.

    Parts required:
    1 – 24 V AC source (Assuming you have a 120/24 Transformer with 24V AC.)
    4 – 1N4007 Rectifier Diodes
    1 – LM2596 Buck DC-DC Adjustable Step Down Power Supply
    1 – Capacitor (I’m using a 22 micro farad unit)

    1. Place the 4 1N4007 rectifier diodes in the solderless breadboard as depicted below.
    2. Install an appropriate capacitor on the DC output of the diodes as depicted.
    3. Tie in the LM2596 DC-DC converter to the output of the diodes.
    4. Tie the 24V side of the transformer to the diodes as depicted below.
    5. Power up the transformer and adjust the DC-DC converter appropriately until the output measures 5V.
    6. Tie in a connector to the 5V output of the DC-DC converter so that you can plug in a Raspberry pi.
    7. Power up the Pi and hopefully it’s working!

    Picture of bench top setup for testing with Raspberry Pi running:
    Raspberry Pi - Powered by 24V AC

    Picture of wiring schematic:
    Raspberry Pi - 24V AC to 5V DC Schematic

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