The AMS1117 is a forward low voltage drop regulator with a voltage drop of 1.2V at 1A current.
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The AMS1117 is available in two versions: fixed output version and adjustable version, with fixed output voltage of 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0V, with 1% accuracy; A fixed output voltage of 1.2V has an accuracy of 2%.