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Multi-functional DC power supply

Overview

This project is a modification of: JLCPCB - Practical DC Regulated Power Supply Design - oshwhub.com/course-examples/shi-yong-zhi-liu-wen-ya-dian-yuan-she-ji.

It uses integrated three-terminal regulators LM7805, LM1117-5, and LM317 to output adjustable voltages of 5V, 3.3V, and a maximum of 27V, respectively.
I added a USB output port to handle certain special situations. The added Zener diode is to prevent excessively high voltage; the USB output voltage should not exceed 100mA, otherwise, the Zener diode may burn out.
This is my first design project, so please forgive any errors and offer your guidance. Thank you.

Design Files

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Update:2026-03-23 14:21:36

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