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This project demonstrates the design of a transformer-less power supply using KiCad.
The circuit converts AC mains input into a regulated DC output using capacitive voltage dropping, rectification, filtering, and regulation.
| Component | Value/Part | Notes |
|---|---|---|
| R1, R2 | 20kΩ | Voltage divider |
| R3 | 1MΩ | Bleeder resistor |
| R4 | 2.2kΩ | LED current limit |
| C1 | 0.1µF | Filter capacitor |
| C2 | 1000µF | Bulk capacitor |
| C3 | 470µF | Output smoothing |
| D1–D4 | 1N4001 | Bridge rectifier |
| D5, D6 | Zener diodes | Voltage regulation |
| D7 | LED | Power indicator |
| U1 | LM7805 | 5V regulator |
| J1 | AC input terminal | |
| J2 | DC output terminal |
This project involves direct connection to mains AC. It is intended for . Do not attempt to build or test without proper isolation, supervision, and protective equipment. Always follow electrical safety standards.
V VAISHNAVI GURUPRIYAA N DISHIKA G
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