This is a 3.3V / 1A mini power supply circuit. The circuit is based on the LM2575N-3.3 step-down (buck) switching regulator Requiring a minimum number of external components, this regulator is simple to use and offers a high-efficiency replacement for popular three-terminal linear regulators. The input voltage must be DC in the range of 6-20V. Input voltage polarity is not critical due to the diodes bridge.
