Function description:
The 220V of the mains is converted into "positive and negative 12V", "positive and negative 5V" and "3.3V", and there is also a way to achieve voltage adjustment. The rectification voltage is also dual power supply, and the range is probably " Positive and negative 2V to plus or minus 22V", in addition, for convenience, 5V, 3.3V in this design increases the output of the USB interface, greatly facilitating the use of MCU workers.
PCB information: Designed with "Altium Designer 10" version, you can use a single-layer circuit board. The parameters of each component of the circuit are complete. If you are unclear, you can contact the author through the contact information in the file.
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