2 thoughts on “Control relay with TIP120

  1. To make this work as intended:
    Place a resistor between the yellow wire and the TIP 120, i guess 1 K would be OK.
    Remove red wire to center pin of TIP 120.
    Move the other red wire from TIP120 and put it directly to the 12 volt source (so 12 volt – relay).
    Remove black wire from the relay.
    Place another wire instead and connect it from relay to center pin of TIP120.

    The relay always has 12 volt, but will only be energized when the TIP120 makes the connection to GND.

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