Adjustable 2–14 V, 1 A DC Power Supply
A compact adjustable DC power supply designed using a custom PCB, transformer-based rectification, and linear voltage regulation. The system provides a stable 2–14 V output and is housed inside a rugged aluminum enclosure with front-panel controls.
Overview
This project implements a compact adjustable DC power supply capable of delivering a regulated output between 2–14 V. The design integrates transformer-based AC conversion, rectification, filtering capacitors, and voltage regulation on a custom printed circuit board.
The final system is mounted inside an aluminum enclosure with front-panel banana jacks for output connections and a potentiometer knob to adjust the output voltage.
Specifications
- Output Voltage: 2–14 V DC adjustable
- Maximum Current: ~1 A
- Input: 120 VAC
- Protection: 1 A fuse on AC input
- Controls: Front-panel voltage adjustment knob
- Connectors: Banana output terminals
Circuit Design
The power supply begins with a step-down transformer converting 120 VAC to a lower AC voltage. A diode bridge rectifier converts the AC signal into DC, which is then smoothed using large electrolytic capacitors.
A linear voltage regulator stage allows the output voltage to be adjusted through a potentiometer, providing a stable and controllable DC output.
PCB Layout
The PCB was designed to minimize wiring complexity and ensure stable power distribution. Large copper traces handle the higher current paths while providing a compact layout suitable for the enclosure.
3D PCB Preview
A 3D render of the board was used to confirm component placement, mechanical clearances, and connector alignment before assembling the final board.
Enclosure Integration
The circuit was integrated into an aluminum project enclosure to provide durability and electrical safety. The front panel includes output banana terminals and a voltage adjustment knob for easy control.
Working Demonstration
The following video demonstrates the completed power supply operating and adjusting the output voltage.