The is a compact, isolated AC-DC switching power supply module frequently used by electronics hobbyists and industrial designers for low-power applications. It is primarily designed to convert high-voltage AC mains (typically 85–265V) into a regulated 5V DC output with a maximum current of 700mA. Its isolated design ensures that the high-voltage input is galvanically separated from the low-voltage output, which is crucial for safety in microcontrollers like the Arduino or ESP32. Key Specifications
: The heart of the circuit is a single-chip offline switcher (such as a TOP series or similar integrated PWM/MOSFET IC). This IC handles the high-frequency switching into the primary side of the isolation transformer. wx-dc12003 schematic
: Powering sensors and wireless modules directly from wall power. The is a compact, isolated AC-DC switching power
: On the output side, a Schottky diode rectifies the transformer's output, which is then filtered by high-quality capacitors to minimize ripple (typically around 60mV at 50% load). Key Specifications : The heart of the circuit
: The AC input typically passes through a small EMI filter and a bridge rectifier. A high-voltage electrolytic capacitor (often 4.7µF, 400V) smooths the rectified DC.
: Providing power for LED drivers or small relay boards. Troubleshooting and Safety Tips 85~265V AC to 5V 3.5W DC Isolated Power Supply Module
: A high-frequency transformer provides the 3kV galvanic isolation between the primary (hot) and secondary (safe) sides.