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If you can afford to drop 0.7V, a resistor of 0R47 in series with the positive supply and a PNP transistor with the emitter to the supply side of the resistor, the basis on the other side and a pull down resistor from the collector to ground.The collector will go positive with a current draw of more than ~1.5A and low otherwise.
edit: no, i do not want to have a voltage drop at all if possible. thanks for the help though.
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