For those looking to create custom layouts, a Kicad library component for the WX-DC12003 is available on GitHub . If you'd like, I can: Tell you which in a picture Compare it to other power modules Explain how to add a fuse for extra safety
Short-circuit, overload, and overtemperature protections 2. WX-DC12003 Circuit Diagram & Schematic Analysis
OUTPUT (pin2) --- L1 (33µH) --- VOUT+ (5V) | D1 (SS34) cathode D1 anode --- GND wx-dc12003 schematic
: You can find 3D renderings and CAD files on GrabCAD and 3D ContentCentral .
The reverse-engineering revealed that the WX-DC12003 is built around a few key, generic components, which explains its low cost. For those looking to create custom layouts, a
| Specification | 5V Variant | 12V Variant | | ------------------------- | ---------------------------------------- | ---------------------------------------- | | Input Voltage (AC) | 50V – 277V (50/60Hz) | 50V – 277V (50/60Hz) | | Input Voltage (DC) | 70V – 390V | 70V – 390V | | Output Voltage | 5V (±0.15V) | 12V (±0.3V) | | Output Current | Up to 700mA | Up to 300mA | | No-Load Power Consumption | <0.05W | <0.05W | | Full-Load Power | ≤3.5W (Typical) / <4W (Max) | ≤3.5W (Typical) / <4W (Max) | Source: Compiled from product listings .
: It typically features a transformer, filter capacitors, and a bridge rectifier to convert mains AC (up to 240V) to stable 5V DC. Technical Resources Technical Resources MOV (Metal Oxide Varistor) or fuse
MOV (Metal Oxide Varistor) or fuse resistor. Bridge Rectifier: Converts AC to DC. Switching IC: Controls flyback switching (Primary side).
The heart of the module is the HT2812H , a PSR controller from the Chinese company HotChip. The schematic in the HT2812H datasheet was confirmed to match the WX-DC12003's implementation. It integrates the PWM controller and a high-voltage power BJT (Bipolar Junction Transistor) internally, driving the transformer's primary winding.