To ensure the output stays exactly at 12V, the schematic employs an and a TL431 precision shunt regulator . The TL431 monitors the output voltage. If the voltage drifts, it signals the optocoupler.
: Approximately 80% with a no-load power consumption of less than 0.05W. wx-dc12003 schematic
Below is a functional breakdown you would see in the full schematic. To ensure the output stays exactly at 12V,
