When reading or tracing the WX-DC12003 schematic, watch for these:
at 50% load. Some users found it necessary to add an external LC filter (choke and capacitor) to achieve a truly clean output for sensitive electronics. : Verified owners on
The most critical and unknown component is the custom flyback transformer . Reverse-engineering its exact specifications (turns ratio, inductance, core material, wire gauge) is difficult and requires specialized equipment. wx-dc12003 schematic
The secondary side includes an output rectifier diode and filtering capacitors. The feedback is achieved through an auxiliary winding on the transformer, which is fed back to the HT2812H's sensing pin, completing the regulation loop without an optocoupler.
[AC/DC Input] ──> [Rectification & Filtering] ──> [PSR Switching Controller IC] │ [High-Freq Flyback Transformer] │ [5V DC Output] <── [Schottky Diode & LC Filter] <────────┘ 1. Input Rectification and Filtering Stage When reading or tracing the WX-DC12003 schematic, watch
If you look at the photo, you will see markings that point out the input (blue circle) and output (green circle) I assume the "L & All About Circuits PSU Module 220V to 5V 700mA Type B - Micro Robotics
85V - 265V AC (50/60 Hz) - Compatible with 110V/220V grids. Output Voltage: 5V DC (±0.1V). Reverse-engineering its exact specifications (turns ratio
The best place to find this wx-dc12003 schematic is the "All About Circuits" forum. A direct link to the relevant discussion thread is https://forum.allaboutcircuits.com/threads/more-information-on-wx-dc12003-and-other-cheap-power-modules-from-aliexpress.192345/ . The community-created schematic is attached to a post within this thread.
A Schottky diode and filter capacitor smooth the output. Some versions include an optocoupler for voltage feedback to keep the 5V steady. Design Variations
Electricity enters the module through the pins designated and N (Neutral) .
No single official schematic exists for the "WX-DC12003" because it is a generic design sold under multiple names (Wanptek, Longwei, Rui Deng). However, the and Korad KA3005P schematics are very close in architecture (differing only in voltage/current scaling resistors).